CVE-2018-20843 (GCVE-0-2018-20843)
Vulnerability from cvelistv5 – Published: 2019-06-24 16:06 – Updated: 2025-05-30 19:39
VLAI
EPSS
VEX
Summary
In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-30 19:37 UTC
CWE
- n/a
- CWE-611 - Improper Restriction of XML External Entity Reference
Assigner
References
21 references
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-05T12:12:28.660Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"name": "USN-4040-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/4040-1/"
},
{
"name": "USN-4040-2",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU",
"x_transferred"
],
"url": "https://usn.ubuntu.com/4040-2/"
},
{
"name": "DSA-4472",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN",
"x_transferred"
],
"url": "https://www.debian.org/security/2019/dsa-4472"
},
{
"name": "20190628 [SECURITY] [DSA 4472-1] expat security update",
"tags": [
"mailing-list",
"x_refsource_BUGTRAQ",
"x_transferred"
],
"url": "https://seclists.org/bugtraq/2019/Jun/39"
},
{
"name": "[debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update",
"tags": [
"mailing-list",
"x_refsource_MLIST",
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html"
},
{
"name": "FEDORA-2019-18868e1715",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/"
},
{
"name": "FEDORA-2019-139fcda84d",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA",
"x_transferred"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/"
},
{
"name": "openSUSE-SU-2019:1777",
"tags": [
"vendor-advisory",
"x_refsource_SUSE",
"x_transferred"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html"
},
{
"name": "GLSA-201911-08",
"tags": [
"vendor-advisory",
"x_refsource_GENTOO",
"x_transferred"
],
"url": "https://security.gentoo.org/glsa/201911-08"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/libexpat/libexpat/issues/186"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/libexpat/libexpat/pull/262"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://security.netapp.com/advisory/ntap-20190703-0001/"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://support.f5.com/csp/article/K51011533"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://www.tenable.com/security/tns-2021-11"
}
],
"title": "CVE Program Container"
},
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2018-20843",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-05-30T19:37:31.145304Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-611",
"description": "CWE-611 Improper Restriction of XML External Entity Reference",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-05-30T19:39:20.442Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks)."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2021-10-20T10:38:09.000Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"name": "USN-4040-1",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/4040-1/"
},
{
"name": "USN-4040-2",
"tags": [
"vendor-advisory",
"x_refsource_UBUNTU"
],
"url": "https://usn.ubuntu.com/4040-2/"
},
{
"name": "DSA-4472",
"tags": [
"vendor-advisory",
"x_refsource_DEBIAN"
],
"url": "https://www.debian.org/security/2019/dsa-4472"
},
{
"name": "20190628 [SECURITY] [DSA 4472-1] expat security update",
"tags": [
"mailing-list",
"x_refsource_BUGTRAQ"
],
"url": "https://seclists.org/bugtraq/2019/Jun/39"
},
{
"name": "[debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update",
"tags": [
"mailing-list",
"x_refsource_MLIST"
],
"url": "https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html"
},
{
"name": "FEDORA-2019-18868e1715",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/"
},
{
"name": "FEDORA-2019-139fcda84d",
"tags": [
"vendor-advisory",
"x_refsource_FEDORA"
],
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/"
},
{
"name": "openSUSE-SU-2019:1777",
"tags": [
"vendor-advisory",
"x_refsource_SUSE"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html"
},
{
"name": "GLSA-201911-08",
"tags": [
"vendor-advisory",
"x_refsource_GENTOO"
],
"url": "https://security.gentoo.org/glsa/201911-08"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/libexpat/libexpat/issues/186"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/libexpat/libexpat/pull/262"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://security.netapp.com/advisory/ntap-20190703-0001/"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://support.f5.com/csp/article/K51011533"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"tags": [
"x_refsource_MISC"
],
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://www.tenable.com/security/tns-2021-11"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "cve@mitre.org",
"ID": "CVE-2018-20843",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "n/a",
"version": {
"version_data": [
{
"version_value": "n/a"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks)."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "n/a"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "USN-4040-1",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4040-1/"
},
{
"name": "USN-4040-2",
"refsource": "UBUNTU",
"url": "https://usn.ubuntu.com/4040-2/"
},
{
"name": "DSA-4472",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2019/dsa-4472"
},
{
"name": "20190628 [SECURITY] [DSA 4472-1] expat security update",
"refsource": "BUGTRAQ",
"url": "https://seclists.org/bugtraq/2019/Jun/39"
},
{
"name": "[debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html"
},
{
"name": "FEDORA-2019-18868e1715",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/"
},
{
"name": "FEDORA-2019-139fcda84d",
"refsource": "FEDORA",
"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/"
},
{
"name": "openSUSE-SU-2019:1777",
"refsource": "SUSE",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html"
},
{
"name": "GLSA-201911-08",
"refsource": "GENTOO",
"url": "https://security.gentoo.org/glsa/201911-08"
},
{
"name": "https://www.oracle.com/security-alerts/cpuapr2020.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuapr2020.html"
},
{
"name": "https://www.oracle.com/security-alerts/cpuoct2020.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuoct2020.html"
},
{
"name": "https://github.com/libexpat/libexpat/issues/186",
"refsource": "MISC",
"url": "https://github.com/libexpat/libexpat/issues/186"
},
{
"name": "https://github.com/libexpat/libexpat/pull/262",
"refsource": "MISC",
"url": "https://github.com/libexpat/libexpat/pull/262"
},
{
"name": "https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6",
"refsource": "MISC",
"url": "https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6"
},
{
"name": "https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes",
"refsource": "MISC",
"url": "https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes"
},
{
"name": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226",
"refsource": "MISC",
"url": "https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226"
},
{
"name": "https://security.netapp.com/advisory/ntap-20190703-0001/",
"refsource": "CONFIRM",
"url": "https://security.netapp.com/advisory/ntap-20190703-0001/"
},
{
"name": "https://support.f5.com/csp/article/K51011533",
"refsource": "CONFIRM",
"url": "https://support.f5.com/csp/article/K51011533"
},
{
"name": "https://www.oracle.com/security-alerts/cpuApr2021.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuApr2021.html"
},
{
"name": "https://www.oracle.com/security-alerts/cpuoct2021.html",
"refsource": "MISC",
"url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
},
{
"name": "https://www.tenable.com/security/tns-2021-11",
"refsource": "CONFIRM",
"url": "https://www.tenable.com/security/tns-2021-11"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2018-20843",
"datePublished": "2019-06-24T16:06:38.000Z",
"dateReserved": "2019-06-24T00:00:00.000Z",
"dateUpdated": "2025-05-30T19:39:20.442Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2018-20843",
"date": "2026-09-16",
"epss": "0.07107",
"percentile": "0.93911"
},
"fkie_nvd": {
"configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"2.2.7\", \"matchCriteriaId\": \"64559605-B284-4E8F-BE76-A52DDC1B26FE\"}]}]}, {\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*\", \"matchCriteriaId\": \"CB66DB75-2B16-4EBF-9B93-CE49D8086E41\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*\", \"matchCriteriaId\": \"815D70A8-47D3-459C-A32C-9FEACA0659D1\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*\", \"matchCriteriaId\": \"F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*\", \"matchCriteriaId\": \"23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"07C312A0-CD2C-4B9C-B064-6409B25C278F\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"CD783B0C-9246-47D9-A937-6144FE8BFF0F\"}]}]}, {\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"DEECE5FC-CACF-4496-A3E7-164736409252\"}]}]}, {\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"D100F7CE-FC64-4CC6-852A-6136D72DA419\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"97A4B8DF-58DA-4AB6-A1F9-331B36409BA3\"}]}]}, {\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"F1E78106-58E6-4D59-990F-75DA575BFAD9\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"B620311B-34A3-48A6-82DF-6F078D7A4493\"}]}]}, {\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:oracle:hospitality_res_3700:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.7\", \"versionEndIncluding\": \"5.7.6\", \"matchCriteriaId\": \"CF89FEEE-C473-42D7-9F68-602792BF729B\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:oracle:http_server:12.1.3.0:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"DD4552F9-F5B9-4A52-BA5C-D32D49FABD28\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"AD04BEE5-E9A8-4584-A68C-0195CE9C402C\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:oracle:outside_in_technology:8.5.4:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"72F1A960-EBA5-4BDB-B629-20F0D2384562\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:oracle:outside_in_technology:8.5.5:*:*:*:*:*:*:*\", \"matchCriteriaId\": \"3198F822-43F8-4CB3-97F7-C2982FDA5CBD\"}]}]}, {\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*\", \"versionEndExcluding\": \"8.15.0\", \"matchCriteriaId\": \"D03C75BD-A1EA-4BF3-8C18-17EB3403C004\"}]}]}]",
"descriptions": "[{\"lang\": \"en\", \"value\": \"In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).\"}, {\"lang\": \"es\", \"value\": \"En libexpat en Expat anterior a versi\\u00f3n 2.2.7, una entrada XML incluyendo nombres XML que contienen una gran cantidad de \\\"dos puntos\\\", podr\\u00eda hacer que el analizador XML consuma una gran cantidad de recursos de RAM y CPU durante el procesamiento (lo suficiente como para ser utilizables en ataques de denegaci\\u00f3n de servicio) .\"}]",
"id": "CVE-2018-20843",
"lastModified": "2024-11-21T04:02:17.487",
"metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 7.5, \"baseSeverity\": \"HIGH\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 3.9, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:L/Au:N/C:N/I:N/A:C\", \"baseScore\": 7.8, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"LOW\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"COMPLETE\"}, \"baseSeverity\": \"HIGH\", \"exploitabilityScore\": 10.0, \"impactScore\": 6.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": false}]}",
"published": "2019-06-24T17:15:09.980",
"references": "[{\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\", \"source\": \"cve@mitre.org\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\", \"source\": \"cve@mitre.org\", \"tags\": [\"Issue Tracking\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\", \"source\": \"cve@mitre.org\", \"tags\": [\"Release Notes\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/issues/186\", \"source\": \"cve@mitre.org\", \"tags\": [\"Issue Tracking\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262\", \"source\": \"cve@mitre.org\", \"tags\": [\"Exploit\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\", \"source\": \"cve@mitre.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\", \"source\": \"cve@mitre.org\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\", \"source\": \"cve@mitre.org\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\", \"source\": \"cve@mitre.org\"}, {\"url\": \"https://seclists.org/bugtraq/2019/Jun/39\", \"source\": \"cve@mitre.org\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://security.gentoo.org/glsa/201911-08\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190703-0001/\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://support.f5.com/csp/article/K51011533\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://usn.ubuntu.com/4040-1/\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://usn.ubuntu.com/4040-2/\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://www.debian.org/security/2019/dsa-4472\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"source\": \"cve@mitre.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2020.html\", \"source\": \"cve@mitre.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\", \"source\": \"cve@mitre.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"source\": \"cve@mitre.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.tenable.com/security/tns-2021-11\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Issue Tracking\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Release Notes\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/issues/186\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Issue Tracking\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}, {\"url\": \"https://seclists.org/bugtraq/2019/Jun/39\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Mailing List\", \"Third Party Advisory\"]}, {\"url\": \"https://security.gentoo.org/glsa/201911-08\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190703-0001/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://support.f5.com/csp/article/K51011533\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://usn.ubuntu.com/4040-1/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://usn.ubuntu.com/4040-2/\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://www.debian.org/security/2019/dsa-4472\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2020.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://www.tenable.com/security/tns-2021-11\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}]",
"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-611\"}]}]"
},
"microsoft_vex": {
"current_release_date": "2020-08-18T00:00:00.000Z",
"cve": "CVE-2018-20843",
"id": "msrc_CVE-2018-20843",
"initial_release_date": "2019-06-02T00:00:00.000Z",
"product_status:fixed": "1",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "In libexpat in Expat before 2.2.7 XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).",
"url": "https://msrc.microsoft.com/csaf/vex/2019/msrc_cve-2018-20843.json",
"version": "1"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2018-20843\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2019-06-24T17:15:09.980\",\"lastModified\":\"2025-05-30T20:15:20.570\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).\"},{\"lang\":\"es\",\"value\":\"En libexpat en Expat anterior a versi\u00f3n 2.2.7, una entrada XML incluyendo nombres XML que contienen una gran cantidad de \\\"dos puntos\\\", podr\u00eda hacer que el analizador XML consuma una gran cantidad de recursos de RAM y CPU durante el procesamiento (lo suficiente como para ser utilizables en ataques de denegaci\u00f3n de servicio) .\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:N/A:C\",\"baseScore\":7.8,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":6.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-611\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-611\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"2.2.7\",\"matchCriteriaId\":\"64559605-B284-4E8F-BE76-A52DDC1B26FE\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*\",\"matchCriteriaId\":\"CB66DB75-2B16-4EBF-9B93-CE49D8086E41\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*\",\"matchCriteriaId\":\"815D70A8-47D3-459C-A32C-9FEACA0659D1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*\",\"matchCriteriaId\":\"F7016A2A-8365-4F1A-89A2-7A19F2BCAE5B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*\",\"matchCriteriaId\":\"23A7C53F-B80F-4E6A-AFA9-58EEA84BE11D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"07C312A0-CD2C-4B9C-B064-6409B25C278F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"CD783B0C-9246-47D9-A937-6144FE8BFF0F\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"C11E6FB0-C8C0-4527-9AA0-CB9B316F8F43\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DEECE5FC-CACF-4496-A3E7-164736409252\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D100F7CE-FC64-4CC6-852A-6136D72DA419\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"97A4B8DF-58DA-4AB6-A1F9-331B36409BA3\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F1E78106-58E6-4D59-990F-75DA575BFAD9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"B620311B-34A3-48A6-82DF-6F078D7A4493\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:hospitality_res_3700:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.7\",\"versionEndIncluding\":\"5.7.6\",\"matchCriteriaId\":\"CF89FEEE-C473-42D7-9F68-602792BF729B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:http_server:12.1.3.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DD4552F9-F5B9-4A52-BA5C-D32D49FABD28\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"AD04BEE5-E9A8-4584-A68C-0195CE9C402C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:outside_in_technology:8.5.4:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"72F1A960-EBA5-4BDB-B629-20F0D2384562\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:oracle:outside_in_technology:8.5.5:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"3198F822-43F8-4CB3-97F7-C2982FDA5CBD\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"8.15.0\",\"matchCriteriaId\":\"D03C75BD-A1EA-4BF3-8C18-17EB3403C004\"}]}]}],\"references\":[{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/issues/186\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/pull/262\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://seclists.org/bugtraq/2019/Jun/39\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/201911-08\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20190703-0001/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://support.f5.com/csp/article/K51011533\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://usn.ubuntu.com/4040-1/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://usn.ubuntu.com/4040-2/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2019/dsa-4472\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuApr2021.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuapr2020.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2020.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2021.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/tns-2021-11\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/issues/186\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/pull/262\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://seclists.org/bugtraq/2019/Jun/39\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.gentoo.org/glsa/201911-08\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20190703-0001/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://support.f5.com/csp/article/K51011533\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://usn.ubuntu.com/4040-1/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://usn.ubuntu.com/4040-2/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.debian.org/security/2019/dsa-4472\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuApr2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuapr2020.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2020.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.oracle.com/security-alerts/cpuoct2021.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://www.tenable.com/security/tns-2021-11\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-28T06:53:40+00:00",
"cve": "CVE-2018-20843",
"id": "CVE-2018-20843",
"initial_release_date": "2018-01-01T00:00:00+00:00",
"product_status:fixed": "201",
"product_status:known_affected": "17",
"product_status:known_not_affected": "24",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "expat: large number of colons in input makes parser consume high amount of resources, leading to DoS",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-20843.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T08:34:11Z",
"cve": "CVE-2018-20843",
"id": "CVE-2018-20843",
"initial_release_date": "2023-02-15T04:20:47Z",
"product_status:known_affected": "379",
"product_status:recommended": "388",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2018-20843",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2018-20843.json",
"version": "49"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://usn.ubuntu.com/4040-1/\", \"name\": \"USN-4040-1\", \"tags\": [\"vendor-advisory\", \"x_refsource_UBUNTU\", \"x_transferred\"]}, {\"url\": \"https://usn.ubuntu.com/4040-2/\", \"name\": \"USN-4040-2\", \"tags\": [\"vendor-advisory\", \"x_refsource_UBUNTU\", \"x_transferred\"]}, {\"url\": \"https://www.debian.org/security/2019/dsa-4472\", \"name\": \"DSA-4472\", \"tags\": [\"vendor-advisory\", \"x_refsource_DEBIAN\", \"x_transferred\"]}, {\"url\": \"https://seclists.org/bugtraq/2019/Jun/39\", \"name\": \"20190628 [SECURITY] [DSA 4472-1] expat security update\", \"tags\": [\"mailing-list\", \"x_refsource_BUGTRAQ\", \"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\", \"name\": \"[debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update\", \"tags\": [\"mailing-list\", \"x_refsource_MLIST\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\", \"name\": \"FEDORA-2019-18868e1715\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\", \"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\", \"name\": \"FEDORA-2019-139fcda84d\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\", \"x_transferred\"]}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\", \"name\": \"openSUSE-SU-2019:1777\", \"tags\": [\"vendor-advisory\", \"x_refsource_SUSE\", \"x_transferred\"]}, {\"url\": \"https://security.gentoo.org/glsa/201911-08\", \"name\": \"GLSA-201911-08\", \"tags\": [\"vendor-advisory\", \"x_refsource_GENTOO\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2020.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/libexpat/libexpat/issues/186\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190703-0001/\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://support.f5.com/csp/article/K51011533\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://www.tenable.com/security/tns-2021-11\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-05T12:12:28.660Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2018-20843\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-05-30T19:37:31.145304Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-611\", \"description\": \"CWE-611 Improper Restriction of XML External Entity Reference\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-05-30T19:37:25.379Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"references\": [{\"url\": \"https://usn.ubuntu.com/4040-1/\", \"name\": \"USN-4040-1\", \"tags\": [\"vendor-advisory\", \"x_refsource_UBUNTU\"]}, {\"url\": \"https://usn.ubuntu.com/4040-2/\", \"name\": \"USN-4040-2\", \"tags\": [\"vendor-advisory\", \"x_refsource_UBUNTU\"]}, {\"url\": \"https://www.debian.org/security/2019/dsa-4472\", \"name\": \"DSA-4472\", \"tags\": [\"vendor-advisory\", \"x_refsource_DEBIAN\"]}, {\"url\": \"https://seclists.org/bugtraq/2019/Jun/39\", \"name\": \"20190628 [SECURITY] [DSA 4472-1] expat security update\", \"tags\": [\"mailing-list\", \"x_refsource_BUGTRAQ\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\", \"name\": \"[debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update\", \"tags\": [\"mailing-list\", \"x_refsource_MLIST\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\", \"name\": \"FEDORA-2019-18868e1715\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\", \"name\": \"FEDORA-2019-139fcda84d\", \"tags\": [\"vendor-advisory\", \"x_refsource_FEDORA\"]}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\", \"name\": \"openSUSE-SU-2019:1777\", \"tags\": [\"vendor-advisory\", \"x_refsource_SUSE\"]}, {\"url\": \"https://security.gentoo.org/glsa/201911-08\", \"name\": \"GLSA-201911-08\", \"tags\": [\"vendor-advisory\", \"x_refsource_GENTOO\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2020.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/libexpat/libexpat/issues/186\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190703-0001/\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://support.f5.com/csp/article/K51011533\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://www.tenable.com/security/tns-2021-11\", \"tags\": [\"x_refsource_CONFIRM\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2021-10-20T10:38:09.000Z\"}, \"x_legacyV4Record\": {\"affects\": {\"vendor\": {\"vendor_data\": [{\"product\": {\"product_data\": [{\"version\": {\"version_data\": [{\"version_value\": \"n/a\"}]}, \"product_name\": \"n/a\"}]}, \"vendor_name\": \"n/a\"}]}}, \"data_type\": \"CVE\", \"references\": {\"reference_data\": [{\"url\": \"https://usn.ubuntu.com/4040-1/\", \"name\": \"USN-4040-1\", \"refsource\": \"UBUNTU\"}, {\"url\": \"https://usn.ubuntu.com/4040-2/\", \"name\": \"USN-4040-2\", \"refsource\": \"UBUNTU\"}, {\"url\": \"https://www.debian.org/security/2019/dsa-4472\", \"name\": \"DSA-4472\", \"refsource\": \"DEBIAN\"}, {\"url\": \"https://seclists.org/bugtraq/2019/Jun/39\", \"name\": \"20190628 [SECURITY] [DSA 4472-1] expat security update\", \"refsource\": \"BUGTRAQ\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html\", \"name\": \"[debian-lts-announce] 20190629 [SECURITY] [DLA 1839-1] expat security update\", \"refsource\": \"MLIST\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/\", \"name\": \"FEDORA-2019-18868e1715\", \"refsource\": \"FEDORA\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/\", \"name\": \"FEDORA-2019-139fcda84d\", \"refsource\": \"FEDORA\"}, {\"url\": \"http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html\", \"name\": \"openSUSE-SU-2019:1777\", \"refsource\": \"SUSE\"}, {\"url\": \"https://security.gentoo.org/glsa/201911-08\", \"name\": \"GLSA-201911-08\", \"refsource\": \"GENTOO\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuapr2020.html\", \"name\": \"https://www.oracle.com/security-alerts/cpuapr2020.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\", \"name\": \"https://www.oracle.com/security-alerts/cpuoct2020.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/libexpat/libexpat/issues/186\", \"name\": \"https://github.com/libexpat/libexpat/issues/186\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262\", \"name\": \"https://github.com/libexpat/libexpat/pull/262\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\", \"name\": \"https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6\", \"refsource\": \"MISC\"}, {\"url\": \"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\", \"name\": \"https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes\", \"refsource\": \"MISC\"}, {\"url\": \"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\", \"name\": \"https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226\", \"refsource\": \"MISC\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20190703-0001/\", \"name\": \"https://security.netapp.com/advisory/ntap-20190703-0001/\", \"refsource\": \"CONFIRM\"}, {\"url\": \"https://support.f5.com/csp/article/K51011533\", \"name\": \"https://support.f5.com/csp/article/K51011533\", \"refsource\": \"CONFIRM\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"name\": \"https://www.oracle.com/security-alerts/cpuApr2021.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"name\": \"https://www.oracle.com/security-alerts/cpuoct2021.html\", \"refsource\": \"MISC\"}, {\"url\": \"https://www.tenable.com/security/tns-2021-11\", \"name\": \"https://www.tenable.com/security/tns-2021-11\", \"refsource\": \"CONFIRM\"}]}, \"data_format\": \"MITRE\", \"description\": {\"description_data\": [{\"lang\": \"eng\", \"value\": \"In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).\"}]}, \"problemtype\": {\"problemtype_data\": [{\"description\": [{\"lang\": \"eng\", \"value\": \"n/a\"}]}]}, \"data_version\": \"4.0\", \"CVE_data_meta\": {\"ID\": \"CVE-2018-20843\", \"STATE\": \"PUBLIC\", \"ASSIGNER\": \"cve@mitre.org\"}}}}",
"cveMetadata": "{\"cveId\": \"CVE-2018-20843\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-30T19:39:20.442Z\", \"dateReserved\": \"2019-06-24T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2019-06-24T16:06:38.000Z\", \"assignerShortName\": \"mitre\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…