CVE-2024-31208

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A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API."}, {"lang": "es", "value": "Synapse es un servidor dom\u00e9stico Matrix de c\u00f3digo abierto. Un usuario remoto de Matrix con intenciones maliciosas, que comparte una sala con instancias de Synapse anteriores a 1.105.1, puede enviar eventos especialmente dise\u00f1ados para explotar una debilidad en el algoritmo de resoluci\u00f3n de estado V2. Esto puede inducir un alto consumo de CPU y acumular datos excesivos en la base de datos de dichas instancias, lo que resulta en una denegaci\u00f3n de servicio. Los servidores de federaciones privadas, o aquellos que no se federan, no se ven afectados. Los administradores del servidor deben actualizar a 1.105.1 o posterior. Algunas soluciones est\u00e1n disponibles. Se puede prohibir a los usuarios malintencionados o a los servidores de bloqueo ACL de las salas y/o abandonar la sala y purgarla utilizando la API de administraci\u00f3n."}], "id": "CVE-2024-31208", "lastModified": "2026-06-17T07:27:59.037", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-31208", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-23T19:13:09.531555Z", "version": "2.0.3"}}]}, "published": "2024-04-23T18:15:14.457", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a"}, {"source": "security-advisories@github.com", "tags": ["Release Notes"], "url": "https://github.com/element-hq/synapse/releases/tag/v1.105.1"}, {"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v"}, {"source": "security-advisories@github.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB/"}, {"source": "security-advisories@github.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RR53FNHV446CB37TP45GZ6F6HZLZCK3K/"}, {"source": "security-advisories@github.com", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://github.com/element-hq/synapse/commit/55b0aa847a61774b6a3acdc4b177a20dc019f01a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Release Notes"], "url": "https://github.com/element-hq/synapse/releases/tag/v1.105.1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-3h7q-rfh9-xm4v"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/R6FCCO4ODTZ3FDS7TMW76PKOSEL2TQVB/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RR53FNHV446CB37TP45GZ6F6HZLZCK3K/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSF4NJJSTSQRJQ47PLYYSCFYKJBP7DET/"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"created": "2025-07-12T22:23:16.954493+00:00", "updated": "2025-07-12T22:23:16.954543+00:00", "vendors": ["element-hq", "element-hq$PRODUCT$synapse"]}