CVE-2022-39955

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A vulnerable back-end can potentially be exploited by declaring multiple Content-Type \"charset\" names and therefore bypassing the configurable CRS Content-Type header \"charset\" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. 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) est\u00e1 afectado por una omisi\u00f3n parcial del conjunto de reglas al enviar un campo de encabezado HTTP Content-Type especialmente dise\u00f1ado que indica m\u00faltiples esquemas de codificaci\u00f3n de caracteres. Un back-end vulnerable puede ser potencialmente explotado declarando m\u00faltiples nombres de Content-Type \"charset\" y, por lo tanto, omitiendo la lista permitida del encabezado Content-Type de CRS. Una carga \u00fatil codificada puede omitir la detecci\u00f3n de CRS de esta manera y puede ser decodificada por el backend. Las versiones heredadas de CRS 3.0.x y 3.1.x est\u00e1n afectadas, 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-2022-39955", "lastModified": "2026-06-17T04:58:34.820", "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": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-39955", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-05-29T13:45:07.091304Z", "version": "2.0.3"}}]}, "published": "2022-09-20T07:15:12.153", "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-863"}], "source": "vulnerability@ncsc.ch", "type": "Secondary"}, {"description": [{"lang": "en", "value": "NVD-CWE-Other"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "mod_security_crs: Multiple charsets defined in Content-Type header", "id": "2131315", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2131315"}, "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-863", "details": ["The OWASP ModSecurity Core Rule Set (CRS) is affected by a partial rule set bypass by submitting a specially crafted HTTP Content-Type header field that indicates multiple character encoding schemes. A vulnerable back-end can potentially be exploited by declaring multiple Content-Type \"charset\" names and therefore bypassing the configurable CRS Content-Type header \"charset\" allow list. An encoded payload can bypass CRS detection this way and may then be decoded by the backend. 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 specially crafted HTTP Content-Type header field allows an encoded payload bypass detection, which may be decoded in the back-end application."], "name": "CVE-2022-39955", "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-2022-39955\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-39955\nhttps://github.com/advisories/GHSA-x6xv-j46p-v597"], "threat_severity": "Moderate"}

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