{"api_version":"1","generated_at":"2026-04-23T05:15:33+00:00","cve":"CVE-2023-45129","urls":{"html":"https://cve.report/CVE-2023-45129","api":"https://cve.report/api/cve/CVE-2023-45129.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-45129","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-45129"},"summary":{"title":"CVE-2023-45129","description":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2023-10-10 18:15:00","updated_at":"2024-01-07 11:15:00"},"problem_types":["CWE-770"],"metrics":[],"references":[{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/","name":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/","refsource":"MISC","tags":[],"title":"[SECURITY] Fedora 39 Update: matrix-synapse-1.94.0-2.fc39 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version","name":"https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version","refsource":"MISC","tags":[],"title":"Rooms - Synapse","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/","name":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/","refsource":"MISC","tags":[],"title":"[SECURITY] Fedora 37 Update: matrix-synapse-1.80.0-7.fc37 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/matrix-org/synapse/pull/16360","name":"https://github.com/matrix-org/synapse/pull/16360","refsource":"MISC","tags":[],"title":"Add a cache around server ACL checking by clokep · Pull Request #16360 · matrix-org/synapse · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://security.gentoo.org/glsa/202401-12","name":"https://security.gentoo.org/glsa/202401-12","refsource":"","tags":[],"title":"","mime":"","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4","name":"https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4","refsource":"MISC","tags":[],"title":"Denial of service due to malicious server ACL events · Advisory · matrix-org/synapse · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/","name":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/","refsource":"MISC","tags":[],"title":"[SECURITY] Fedora 38 Update: matrix-synapse-1.94.0-2.fc38 - package-announce - Fedora Mailing-Lists","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2023-45129","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-45129","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2023","cve_id":"45129","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"37","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2023","cve_id":"45129","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"fedoraproject","cpe5":"fedora","cpe6":"38","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"},{"cve_year":"2023","cve_id":"45129","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"matrix","cpe5":"synapse","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2023-45129","qid":"284642","title":"Fedora Security Update for matrix (FEDORA-2023-c3c8cc5f8b)"},{"cve":"CVE-2023-45129","qid":"284661","title":"Fedora Security Update for matrix (FEDORA-2023-954c2ec5bd)"},{"cve":"CVE-2023-45129","qid":"285204","title":"Fedora Security Update for matrix (FEDORA-2023-4d4c73a8f0)"},{"cve":"CVE-2023-45129","qid":"503384","title":"Alpine Linux Security Update for synapse"},{"cve":"CVE-2023-45129","qid":"506256","title":"Alpine Linux Security Update for synapse"},{"cve":"CVE-2023-45129","qid":"710826","title":"Gentoo Linux Synapse Multiple Vulnerabilities (GLSA 202401-12)"},{"cve":"CVE-2023-45129","qid":"995561","title":"Python (Pip) Security Update for matrix-synapse (GHSA-5chr-wjw5-3gq4)"}]},"source_records":{"cve_program":{"data_version":"4.0","data_type":"CVE","data_format":"MITRE","CVE_data_meta":{"ID":"CVE-2023-45129","ASSIGNER":"security-advisories@github.com","STATE":"PUBLIC"},"description":{"description_data":[{"lang":"eng","value":"Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, a malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service. Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API."}]},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-770: Allocation of Resources Without Limits or Throttling","cweId":"CWE-770"}]}]},"affects":{"vendor":{"vendor_data":[{"vendor_name":"matrix-org","product":{"product_data":[{"product_name":"synapse","version":{"version_data":[{"version_affected":"=","version_value":"< 1.94.0"}]}}]}}]}},"references":{"reference_data":[{"url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4","refsource":"MISC","name":"https://github.com/matrix-org/synapse/security/advisories/GHSA-5chr-wjw5-3gq4"},{"url":"https://github.com/matrix-org/synapse/pull/16360","refsource":"MISC","name":"https://github.com/matrix-org/synapse/pull/16360"},{"url":"https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version","refsource":"MISC","name":"https://matrix-org.github.io/synapse/latest/admin_api/rooms.html#version-2-new-version"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/","refsource":"MISC","name":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WRO4MPQ6HOXIUZM6RJP6VTCTMV7RD2T3/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/","refsource":"MISC","name":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/KEVRB4MG5UXQ5RLZHSUJXM5GWEBYYS5B/"},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/","refsource":"MISC","name":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/"}]},"source":{"advisory":"GHSA-5chr-wjw5-3gq4","discovery":"UNKNOWN"},"impact":{"cvss":[{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":4.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}]}},"nvd":{"publishedDate":"2023-10-10 18:15:00","lastModifiedDate":"2024-01-07 11:15:00","problem_types":["CWE-770"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":4.9,"baseSeverity":"MEDIUM"},"exploitabilityScore":1.2,"impactScore":3.6}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*","versionEndExcluding":"1.94.0","cpe_name":[]}]},{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*","cpe_name":[]},{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*","cpe_name":[]}]}]}},"legacy_mitre":{"record":null,"notes":[]}}}