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
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"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"
}
}
}
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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.
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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.
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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.
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