{"api_version":"1","generated_at":"2026-04-23T07:00:56+00:00","cve":"CVE-2021-29433","urls":{"html":"https://cve.report/CVE-2021-29433","api":"https://cve.report/api/cve/CVE-2021-29433.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-29433","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-29433"},"summary":{"title":"CVE-2021-29433","description":"Sydent is a reference Matrix identity server. In Sydent versions 2.2.0 and prior, sissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. A patch for the vulnerability is in version 2.3.0. No workarounds are known to exist.","state":"PUBLIC","assigner":"security-advisories@github.com","published_at":"2021-04-15 18:15:00","updated_at":"2022-08-02 16:01:00"},"problem_types":["CWE-20"],"metrics":[],"references":[{"url":"https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553","name":"https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553","refsource":"CONFIRM","tags":[],"title":"Denial of service (via resource exhaustion) due to improper input validation · Advisory · matrix-org/sydent · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://pypi.org/project/matrix-sydent/","name":"https://pypi.org/project/matrix-sydent/","refsource":"MISC","tags":[],"title":"matrix-sydent · PyPI","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da","name":"https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da","refsource":"MISC","tags":[],"title":"Validation improvements · matrix-org/sydent@3175fd3 · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"404"},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-29433","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-29433","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2021","cve_id":"29433","vulnerable":"1","versionEndIncluding":"","cpe1":"cpe","cpe2":"2.3","cpe3":"a","cpe4":"matrix","cpe5":"sydent","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[{"cve":"CVE-2021-29433","qid":"982338","title":"Python (pip) Security Update for matrix-sydent (GHSA-pw4v-gr34-2553)"}]},"source_records":{"cve_program":{"CVE_data_meta":{"ASSIGNER":"security-advisories@github.com","ID":"CVE-2021-29433","STATE":"PUBLIC","TITLE":"Denial of service (via resource exhaustion) due to improper input validation"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"sydent","version":{"version_data":[{"version_value":"<= 2.2.0"}]}}]},"vendor_name":"matrix-org"}]}},"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Sydent is a reference Matrix identity server. In Sydent versions 2.2.0 and prior, sissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. A patch for the vulnerability is in version 2.3.0. No workarounds are known to exist."}]},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"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:L","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"{\"CWE-20\":\"Improper Input Validation\"}"}]}]},"references":{"reference_data":[{"name":"https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553","refsource":"CONFIRM","url":"https://github.com/matrix-org/sydent/security/advisories/GHSA-pw4v-gr34-2553"},{"name":"https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da","refsource":"MISC","url":"https://github.com/matrix-org/sydent/commit/3175fd358ebc2c310eab7a3dbf296ce2bd54c1da"}]},"source":{"advisory":"GHSA-pw4v-gr34-2553","discovery":"UNKNOWN"}},"nvd":{"publishedDate":"2021-04-15 18:15:00","lastModifiedDate":"2022-08-02 16:01:00","problem_types":["CWE-20"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM"},"exploitabilityScore":2.8,"impactScore":1.4},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:S/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"SINGLE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":4},"severity":"MEDIUM","exploitabilityScore":8,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:a:matrix:sydent:*:*:*:*:*:*:*:*","versionEndExcluding":"2.3.0","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2021","CveId":"29433","Ordinal":"204637","Title":"CVE-2021-29433","CVE":"CVE-2021-29433","Year":"2021"},"notes":[{"CveYear":"2021","CveId":"29433","Ordinal":"1","NoteData":"Sydent is a reference Matrix identity server. In Sydent versions 2.2.0 and prior, sissing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. A patch for the vulnerability is in version 2.3.0. No workarounds are known to exist.","Type":"Description","Title":null},{"CveYear":"2021","CveId":"29433","Ordinal":"2","NoteData":"2021-04-15","Type":"Other","Title":"Published"},{"CveYear":"2021","CveId":"29433","Ordinal":"3","NoteData":"2021-06-07","Type":"Other","Title":"Modified"}]}}}