{"id":"CVE-2021-35211","aliases":["EUVD-2021-21854","GHSA-cpmg-9xq8-3934"],"status":"published","title":"Serv-U Remote Memory Escape Vulnerability","description":"Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.","severity":{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.9116,"percentile":0.9981,"model":"v2026.06.15"},"facts":{"in_kev":true,"known_exploited":true,"public_exploit":true,"fix_available":false},"cwes":["CWE-668","CWE-787"],"published":"2021-07-14T20:55:25Z","modified":"2026-06-17T03:57:18Z","kev":{"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","known_ransomware_use":"Known"},"exploitation":[{"source":"euvd","since":"2021-11-03"},{"source":"kev","since":"2021-11-03"}],"exploits":[{"source":"pocgithub","id":"NattiSamson/Serv-U-CVE-2021-35211","title":"NattiSamson/Serv-U-CVE-2021-35211","date":"2021-09-30","url":"https://github.com/NattiSamson/Serv-U-CVE-2021-35211"},{"source":"pocgithub","id":"0xhaggis/CVE-2021-35211","title":"0xhaggis/CVE-2021-35211","date":"2021-10-24","url":"https://github.com/0xhaggis/CVE-2021-35211"},{"source":"pocgithub","id":"BishopFox/CVE-2021-35211","title":"BishopFox/CVE-2021-35211","date":"2022-01-14","url":"https://github.com/BishopFox/CVE-2021-35211"},{"source":"nuclei","id":"CVE-2021-35211","title":"SolarWinds Serv-U FTP - Remote Code Execution","type":"detection template","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2021/CVE-2021-35211.yaml"}],"products":[{"vendor":"solarwinds","product":"serv-u"},{"vendor":"solarwinds","product":"serv-u managed file transfer server and serv-u secured ftp"}],"references":[{"url":"https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35211","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"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","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-35211","tags":["government-resource","US Government Resource"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-35211"},{"url":"https://github.com/advisories/GHSA-cpmg-9xq8-3934"}],"sources":{"cve":[{"id":"CVE-2021-35211","title":"Serv-U Remote Memory Escape Vulnerability","description":"Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. 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SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.","status":"published","published":"2021-07-14T20:55:25Z","modified":"2025-10-21T23:25:40Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"exploited_since":"2021-11-03","updated_at":"2026-11-02T20:31:25.901288Z"}],"ghsa":[{"id":"GHSA-cpmg-9xq8-3934","title":"Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product...","description":"Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. 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