CVE-2022-39957

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A client can issue an HTTP Accept header field containing an optional \"charset\" parameter in order to receive the response in an encoded form. Depending on the \"charset\", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively."}, {"lang": "es", "value": "OWASP ModSecurity Core Rule Set (CRS) esta afectado por una omisi\u00f3n del cuerpo de respuesta. Un cliente puede emitir un campo de encabezado HTTP Accept que contenga un par\u00e1metro opcional \"charset\" para recibir la respuesta de forma codificada. En funci\u00f3n del \"charset\", esta respuesta puede no ser descodificada por el firewall de la aplicaci\u00f3n web. Por lo tanto, un recurso restringido, cuyo acceso ser\u00eda detectado normalmente, puede omitir la detecci\u00f3n. Est\u00e1n afectadas las versiones 3.0.x y 3.1.x del CRS heredado, as\u00ed como las versiones 3.2.1 y 3.3.2 actualmente soportadas. Es recomendado a integradores y usuarios actualizar a versiones 3.2.2 y 3.3.3 respectivamente"}], "id": "CVE-2022-39957", "lastModified": "2026-06-17T04:58:35.093", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.4, "source": "vulnerability@ncsc.ch", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-39957", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-05-29T13:43:57.335368Z", "version": "2.0.3"}}]}, "published": "2022-09-20T07:15:12.353", "references": [{"source": "vulnerability@ncsc.ch", "tags": ["Patch", "Vendor Advisory"], "url": "https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/"}, {"source": "vulnerability@ncsc.ch", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2023/01/msg00033.html"}, {"source": "vulnerability@ncsc.ch", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HL2L2GF7GOCWPMJZDUE5OXDSXHGG3XUJ/"}, {"source": "vulnerability@ncsc.ch", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PD56EAYNGB6E6QQH62LAYCONOP6OH5DZ/"}, {"source": "vulnerability@ncsc.ch", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPQ6CCMX3MU4A7MTCGQJA7VMJW3IQDXV/"}, {"source": "vulnerability@ncsc.ch", "url": "https://security.gentoo.org/glsa/202305-25"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch", "Vendor Advisory"], "url": "https://coreruleset.org/20220919/crs-version-3-3-3-and-3-2-2-covering-several-cves/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2023/01/msg00033.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00004.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HL2L2GF7GOCWPMJZDUE5OXDSXHGG3XUJ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PD56EAYNGB6E6QQH62LAYCONOP6OH5DZ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YPQ6CCMX3MU4A7MTCGQJA7VMJW3IQDXV/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://security.gentoo.org/glsa/202305-25"}], "sourceIdentifier": "vulnerability@ncsc.ch", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-693"}], "source": "vulnerability@ncsc.ch", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-116"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "mod_security_crs: Charset accept header field resulting in response rule set bypass", "id": "2131319", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2131319"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-693", "details": ["The OWASP ModSecurity Core Rule Set (CRS) is affected by a response body bypass. A client can issue an HTTP Accept header field containing an optional \"charset\" parameter in order to receive the response in an encoded form. Depending on the \"charset\", this response can not be decoded by the web application firewall. A restricted resource, access to which would ordinarily be detected, may therefore bypass detection. The legacy CRS versions 3.0.x and 3.1.x are affected, as well as the currently supported versions 3.2.1 and 3.3.2. Integrators and users are advised to upgrade to 3.2.2 and 3.3.3 respectively.", "A flaw was found in the OWASP ModSecurity Core Rule Set. A payload with a HTTP accept header field containing a charset that can't be decoded by the Web Application Firewall allows a response body bypass, resulting in access to restricted resources."], "name": "CVE-2022-39957", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "mod_security_crs", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "mod_security_crs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "mod_security_crs", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2022-09-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-39957\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-39957\nhttps://github.com/advisories/GHSA-cxqq-h5hh-jgq2"], "threat_severity": "Moderate"}

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