{"containers":{"cna":{"affected":[{"product":"synapse","vendor":"matrix-org","versions":[{"status":"affected","version":"< 1.33.2"}]}],"descriptions":[{"lang":"en","value":"Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 \"Push rules\" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2021-08-02T02:06:25.000Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"tags":["x_refsource_CONFIRM"],"url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85"},{"tags":["x_refsource_MISC"],"url":"https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c"},{"tags":["x_refsource_MISC"],"url":"https://github.com/matrix-org/synapse/releases/tag/v1.33.2"},{"name":"FEDORA-2021-a627cfd31e","tags":["vendor-advisory","x_refsource_FEDORA"],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/"}],"source":{"advisory":"GHSA-x345-32rc-8h85","discovery":"UNKNOWN"},"title":"Denial of service in Matrix Synapse","x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-29471","STATE":"PUBLIC","TITLE":"Denial of service in Matrix Synapse"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"synapse","version":{"version_data":[{"version_value":"< 1.33.2"}]}}]},"vendor_name":"matrix-org"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.33.2 \"Push rules\" can specify conditions under which they will match, including `event_match`, which matches event content against a pattern including wildcards. Certain patterns can cause very poor performance in the matching engine, leading to a denial-of-service when processing moderate length events. The issue is patched in version 1.33.2. A potential workaround might be to prevent users from making custom push rules, by blocking such requests at a reverse-proxy."}]},"impact":{"cvss":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":3.7,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-400: Uncontrolled Resource Consumption"}]}]},"references":{"reference_data":[{"name":"https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85","refsource":"CONFIRM","url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85"},{"name":"https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c","refsource":"MISC","url":"https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c"},{"name":"https://github.com/matrix-org/synapse/releases/tag/v1.33.2","refsource":"MISC","url":"https://github.com/matrix-org/synapse/releases/tag/v1.33.2"},{"name":"FEDORA-2021-a627cfd31e","refsource":"FEDORA","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/"}]},"source":{"advisory":"GHSA-x345-32rc-8h85","discovery":"UNKNOWN"}}},"adp":[{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-03T22:11:05.476Z"},"title":"CVE Program Container","references":[{"tags":["x_refsource_CONFIRM","x_transferred"],"url":"https://github.com/matrix-org/synapse/security/advisories/GHSA-x345-32rc-8h85"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/matrix-org/synapse/commit/03318a766cac9f8b053db2214d9c332a977d226c"},{"tags":["x_refsource_MISC","x_transferred"],"url":"https://github.com/matrix-org/synapse/releases/tag/v1.33.2"},{"name":"FEDORA-2021-a627cfd31e","tags":["vendor-advisory","x_refsource_FEDORA","x_transferred"],"url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY/"}]}]},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2021-29471","datePublished":"2021-05-11T15:05:12.000Z","dateReserved":"2021-03-30T00:00:00.000Z","dateUpdated":"2024-08-03T22:11:05.476Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"}