CVE-2021-32813

{"containers": {"cna": {"affected": [{"product": "traefik", "vendor": "traefik", "versions": [{"status": "affected", "version": "< 2.4.13"}, {"status": "affected", "version": "<= 1.7.30"}]}], "descriptions": [{"lang": "en", "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.4.13, there exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse. If one has a chain of Traefik middlewares, and one of them sets a request header, then sending a request with a certain Connection header will cause it to be removed before the request is sent. In this case, the backend does not see the request header. A patch is available in version 2.4.13. There are no known workarounds aside from upgrading."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-913", "description": "CWE-913: Improper Control of Dynamically-Managed Code Resources", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"dateUpdated": "2021-08-03T22:50:11.000Z", "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M"}, "references": [{"tags": ["x_refsource_CONFIRM"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9"}, {"tags": ["x_refsource_MISC"], "url": "https://github.com/traefik/traefik/releases/tag/v2.4.13"}], "source": {"advisory": "GHSA-m697-4v8f-55qg", "discovery": "UNKNOWN"}, "title": "Drop Headers via Malicious Connection Header", "x_legacyV4Record": {"CVE_data_meta": {"ASSIGNER": "security-advisories@github.com", "ID": "CVE-2021-32813", "STATE": "PUBLIC", "TITLE": "Drop Headers via Malicious Connection Header"}, "affects": {"vendor": {"vendor_data": [{"product": {"product_data": [{"product_name": "traefik", "version": {"version_data": [{"version_value": "< 2.4.13"}, {"version_value": "<= 1.7.30"}]}}]}, "vendor_name": "traefik"}]}}, "data_format": "MITRE", "data_type": "CVE", "data_version": "4.0", "description": {"description_data": [{"lang": "eng", "value": "Traefik is an HTTP reverse proxy and load balancer. 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There are no known workarounds aside from upgrading."}]}, "impact": {"cvss": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}}, "problemtype": {"problemtype_data": [{"description": [{"lang": "eng", "value": "CWE-913: Improper Control of Dynamically-Managed Code Resources"}]}]}, "references": {"reference_data": [{"name": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg", "refsource": "CONFIRM", "url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg"}, {"name": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9", "refsource": "MISC", "url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9"}, {"name": "https://github.com/traefik/traefik/releases/tag/v2.4.13", "refsource": "MISC", "url": "https://github.com/traefik/traefik/releases/tag/v2.4.13"}]}, "source": {"advisory": "GHSA-m697-4v8f-55qg", "discovery": "UNKNOWN"}}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T23:33:55.883Z"}, "title": "CVE Program Container", "references": [{"tags": ["x_refsource_CONFIRM", "x_transferred"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9"}, {"tags": ["x_refsource_MISC", "x_transferred"], "url": "https://github.com/traefik/traefik/releases/tag/v2.4.13"}]}]}, "cveMetadata": {"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "assignerShortName": "GitHub_M", "cveId": "CVE-2021-32813", "datePublished": "2021-08-03T22:50:11.000Z", "dateReserved": "2021-05-12T00:00:00.000Z", "dateUpdated": "2024-08-03T23:33:55.883Z", "state": "PUBLISHED"}, "dataType": "CVE_RECORD", "dataVersion": "5.1"}

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{"affected": [{"affectedData": [{"product": "traefik", "vendor": "traefik", "versions": [{"status": "affected", "version": "< 2.4.13"}, {"status": "affected", "version": "<= 1.7.30"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*", "matchCriteriaId": "6AE4F485-8B9A-4136-928F-31D7072F71D0", "versionEndExcluding": "2.4.13", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Traefik is an HTTP reverse proxy and load balancer. Prior to version 2.4.13, there exists a potential header vulnerability in Traefik's handling of the Connection header. Active exploitation of this issue is unlikely, as it requires that a removed header would lead to a privilege escalation, however, the Traefik team has addressed this issue to prevent any potential abuse. If one has a chain of Traefik middlewares, and one of them sets a request header, then sending a request with a certain Connection header will cause it to be removed before the request is sent. In this case, the backend does not see the request header. A patch is available in version 2.4.13. There are no known workarounds aside from upgrading."}, {"lang": "es", "value": "Traefik es un proxy inverso HTTP y un equilibrador de carga. Anterior a versi\u00f3n 2.4.13, se presentaba una potencial vulnerabilidad de encabezado en el manejo del encabezado Connection de Traefik. Una explotaci\u00f3n activa de este problema es poco probable, ya que requiere que un encabezado eliminado conllevar\u00eda a una escalada de privilegios, sin embargo, el equipo de Traefik ha abordado este problema para impedir cualquier abuso potencial. Si uno presenta una cadena de middlewares de Traefik, y uno de ellos establece un encabezado de petici\u00f3n, entonces el env\u00edo de una petici\u00f3n con una determinado encabezado de conexi\u00f3n causar\u00e1 que se elimine antes de que se env\u00ede la petici\u00f3n. En este caso, el backend no visualiza la cabecera de petici\u00f3n. Se presenta un parche disponible en la versi\u00f3n 2.4.13. No hay soluciones conocidas aparte de la actualizaci\u00f3n"}], "id": "CVE-2021-32813", "lastModified": "2026-06-17T03:53:41.063", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 6.8, "confidentialityImpact": "PARTIAL", "integrityImpact": "PARTIAL", "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 6.4, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 4.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2021-08-03T23:15:07.370", "references": [{"source": "security-advisories@github.com", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/traefik/traefik/releases/tag/v2.4.13"}, {"source": "security-advisories@github.com", "tags": ["Third Party Advisory"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Third Party Advisory"], "url": "https://github.com/traefik/traefik/pull/8319/commits/cbaf86a93014a969b8accf39301932c17d0d73f9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/traefik/traefik/releases/tag/v2.4.13"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://github.com/traefik/traefik/security/advisories/GHSA-m697-4v8f-55qg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-913"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-913"}], "source": "nvd@nist.gov", "type": "Primary"}]}

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