CVE-2020-8138 (GCVE-0-2020-8138)
Vulnerability from cvelistv5 – Published: 2020-03-20 20:12 – Updated: 2024-08-04 09:48
VLAI
EPSS
VEX
Summary
A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.
Severity
6.5 (Medium)
CWE
- CWE-918 - Server-Side Request Forgery (SSRF) (CWE-918)
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://hackerone.com/reports/736867 | x_refsource_MISC |
| https://nextcloud.com/security/advisory/?id=NC-SA… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| n/a | Nextcloud Server |
Affected:
Fixed in 17.0.2, 16.0.7, and 15.0.14
|
{
"containers": {
"adp": [
{
"providerMetadata": {
"dateUpdated": "2024-08-04T09:48:25.824Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_refsource_MISC",
"x_transferred"
],
"url": "https://hackerone.com/reports/736867"
},
{
"tags": [
"x_refsource_CONFIRM",
"x_transferred"
],
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"product": "Nextcloud Server",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "Fixed in 17.0.2, 16.0.7, and 15.0.14"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A missing check for IPv4 nested inside IPv6 in Nextcloud server \u003c 17.0.1, \u003c 16.0.7, and \u003c 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL."
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-918",
"description": "Server-Side Request Forgery (SSRF) (CWE-918)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2020-03-20T20:12:26.000Z",
"orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"shortName": "hackerone"
},
"references": [
{
"tags": [
"x_refsource_MISC"
],
"url": "https://hackerone.com/reports/736867"
},
{
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
}
],
"x_legacyV4Record": {
"CVE_data_meta": {
"ASSIGNER": "support@hackerone.com",
"ID": "CVE-2020-8138",
"STATE": "PUBLIC"
},
"affects": {
"vendor": {
"vendor_data": [
{
"product": {
"product_data": [
{
"product_name": "Nextcloud Server",
"version": {
"version_data": [
{
"version_value": "Fixed in 17.0.2, 16.0.7, and 15.0.14"
}
]
}
}
]
},
"vendor_name": "n/a"
}
]
}
},
"data_format": "MITRE",
"data_type": "CVE",
"data_version": "4.0",
"description": {
"description_data": [
{
"lang": "eng",
"value": "A missing check for IPv4 nested inside IPv6 in Nextcloud server \u003c 17.0.1, \u003c 16.0.7, and \u003c 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL."
}
]
},
"problemtype": {
"problemtype_data": [
{
"description": [
{
"lang": "eng",
"value": "Server-Side Request Forgery (SSRF) (CWE-918)"
}
]
}
]
},
"references": {
"reference_data": [
{
"name": "https://hackerone.com/reports/736867",
"refsource": "MISC",
"url": "https://hackerone.com/reports/736867"
},
{
"name": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014",
"refsource": "CONFIRM",
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
"assignerShortName": "hackerone",
"cveId": "CVE-2020-8138",
"datePublished": "2020-03-20T20:12:26.000Z",
"dateReserved": "2020-01-28T00:00:00.000Z",
"dateUpdated": "2024-08-04T09:48:25.824Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2020-8138",
"date": "2026-09-18",
"epss": "0.01395",
"percentile": "0.7115"
},
"fkie_nvd": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "69BE13A7-612F-4C06-B9DD-D5CADE0E89BB",
"versionEndExcluding": "15.0.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "69BAB965-AE57-4674-BF4E-484F779DE1E1",
"versionEndExcluding": "16.0.7",
"versionStartIncluding": "16.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4DA73A56-619E-44C9-858A-23DD0EC7730C",
"versionEndExcluding": "17.0.2",
"versionStartIncluding": "17.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "A missing check for IPv4 nested inside IPv6 in Nextcloud server \u003c 17.0.1, \u003c 16.0.7, and \u003c 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL."
},
{
"lang": "es",
"value": "Una falta de comprobaci\u00f3n de IPv4 anidado dentro de IPv6 en el servidor Nextcloud versiones anteriores a 17.0.1, versiones anteriores a 16.0.7 y versiones anteriores a 15.0.14, permiti\u00f3 una vulnerabilidad de tipo Server-Side Request Forgery (SSRF) cuando se suscribe en una URL de calendario maliciosa."
}
],
"id": "CVE-2020-8138",
"lastModified": "2024-11-21T05:38:22.020",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "NONE",
"baseScore": 4.0,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2020-03-20T21:15:17.547",
"references": [
{
"source": "support@hackerone.com",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/736867"
},
{
"source": "support@hackerone.com",
"tags": [
"Third Party Advisory"
],
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/736867"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
}
],
"sourceIdentifier": "support@hackerone.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "support@hackerone.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"nvd": {
"cve": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "69BE13A7-612F-4C06-B9DD-D5CADE0E89BB",
"versionEndExcluding": "15.0.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "69BAB965-AE57-4674-BF4E-484F779DE1E1",
"versionEndExcluding": "16.0.7",
"versionStartIncluding": "16.0.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
"matchCriteriaId": "4DA73A56-619E-44C9-858A-23DD0EC7730C",
"versionEndExcluding": "17.0.2",
"versionStartIncluding": "17.0.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "A missing check for IPv4 nested inside IPv6 in Nextcloud server \u003c 17.0.1, \u003c 16.0.7, and \u003c 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL."
},
{
"lang": "es",
"value": "Una falta de comprobaci\u00f3n de IPv4 anidado dentro de IPv6 en el servidor Nextcloud versiones anteriores a 17.0.1, versiones anteriores a 16.0.7 y versiones anteriores a 15.0.14, permiti\u00f3 una vulnerabilidad de tipo Server-Side Request Forgery (SSRF) cuando se suscribe en una URL de calendario maliciosa."
}
],
"id": "CVE-2020-8138",
"lastModified": "2024-11-21T05:38:22.020",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "MEDIUM",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "SINGLE",
"availabilityImpact": "NONE",
"baseScore": 4.0,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:S/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.0,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2020-03-20T21:15:17.547",
"references": [
{
"source": "support@hackerone.com",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/736867"
},
{
"source": "support@hackerone.com",
"tags": [
"Third Party Advisory"
],
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Exploit",
"Third Party Advisory"
],
"url": "https://hackerone.com/reports/736867"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Third Party Advisory"
],
"url": "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014"
}
],
"sourceIdentifier": "support@hackerone.com",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "support@hackerone.com",
"type": "Secondary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-918"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
},
"redhat_vex": {
"current_release_date": "2025-11-21T16:07:19+00:00",
"cve": "CVE-2020-8138",
"id": "CVE-2020-8138",
"initial_release_date": "2020-03-20T00:00:00+00:00",
"product_status:known_not_affected": "1",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "nextcloud: a Server-Side Request Forgery vulnerability when subscribing to a malicious calendar URL",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-8138.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2025-02-17T06:48:27Z",
"cve": "CVE-2020-8138",
"id": "CVE-2020-8138",
"initial_release_date": "2023-02-15T04:01:33Z",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2020-8138",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-8138.json",
"version": "5"
}
}
}
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…