{"schema":"threatline.record/2","record":{"id":"CVE-2021-35211","aliases":[],"summary":"SolarWinds Serv-U Remote Code Execution Vulnerability","details":"SolarWinds Serv-U contains an unspecified memory escape vulnerability which can allow for remote code execution.","categories":["Network & edge"],"product":"Serv-U","vendor":"SolarWinds","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-35211","source_modified_at":"2025-10-21T23:25:40.369Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Serv-U Managed File Transfer Server and Serv-U Secured FTP","vendor":"SolarWinds","versions":[{"lessThan":"15.2.3 HF1","status":"affected","version":"SolarWinds Serv-U","versionType":"custom"}],"defaultStatus":null}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-35211","source_modified_at":"2025-10-21T23:25:40.369Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Serv-U Managed File Transfer Server and Serv-U Secured FTP","ecosystem":null},"version":"15.2.3 HF1","basis":"first unaffected version stated in the CVE record"}],"cvss":9,"severity":"Critical","kev":{"listed":true,"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Known"},"epss":{"probability":0.9116,"percentile":0.99812,"score_date":"2026-10-23"},"published_at":"2021-07-14T20:55:25.167Z","modified_at":"2025-10-21T23:25:40.369Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2021-35211","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:40.369Z"},{"source":"Nuclei","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2021/CVE-2021-35211.yaml","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":null},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-35211","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","Nuclei","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35211","source":"CISA KEV"},{"source":"CVE List","url":"https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.microsoft.com/security/blog/2021/07/13/microsoft-discovers-threat-actor-targeting-solarwinds-serv-u-software-with-0-day-exploit","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35211","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"total","assessed_at":"2025-02-04T19:06:30.616456Z"},"exploits":[{"source":"Nuclei","kind":"Scanner template","name":"SolarWinds Serv-U FTP - Remote Code Execution","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2021/CVE-2021-35211.yaml"}],"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2025-10-21T23:25:40.369Z","content_hash":"2060dc1964976e463c02032afeaaf6a4e0f5463ac1652b735ac2b3856a15b9fc"}}