{"id":"CVE-2021-3331","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-3331","generatedAt":"2026-10-28T04:17:25.814Z","title":"WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings.","description":"WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings. (For example, this is exploitable in a default installation in which WinSCP is the handler for sftp:// URLs.)","published":"2021-01-27T21:15:17.000Z","lastModified":"2026-10-08T21:17:40.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":[],"affected":["winscp/winscp"],"epss":{"score":0.07703,"percentile":0.94575,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (7.70%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://winscp.net/eng/docs/history#5.17.10","tags":["Release Notes","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://winscp.net/eng/docs/rawsettings","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://winscp.net/tracker/1943","tags":["Patch","Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://winscp.net/eng/docs/history#5.17.10","tags":["Release Notes","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://winscp.net/eng/docs/rawsettings","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://winscp.net/tracker/1943","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-3331","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}