CVE-2021-3331
criticalWinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings.
Vendor / product: Winscp — winscp
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.)
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2021-01-27 21:15
Modified: 2026-10-08 21:17
NVD status: Modified
Last synced 3 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
winscp / winscp <5.17.10
Weakness classification (CWE)
NVD-CWE-Other
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://winscp.net/eng/docs/history#5.17.10
Vendor advisory: https://winscp.net/eng/docs/rawsettings
Vendor advisory: https://winscp.net/tracker/1943
Vendor advisory: https://winscp.net/eng/docs/history#5.17.10
Vendor advisory: https://winscp.net/eng/docs/rawsettings
Vendor advisory: https://winscp.net/tracker/1943
Patch / mitigation: https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d
Patch / mitigation: https://winscp.net/tracker/1943
Patch / mitigation: https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d
Patch / mitigation: https://winscp.net/tracker/1943
References
- https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d cve@mitre.org
- https://winscp.net/eng/docs/history#5.17.10 cve@mitre.org
- https://winscp.net/eng/docs/rawsettings cve@mitre.org
- https://winscp.net/tracker/1943 cve@mitre.org
- https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d af854a3a-2127-422b-91ae-364da2661108
- https://winscp.net/eng/docs/history#5.17.10 af854a3a-2127-422b-91ae-364da2661108
- https://winscp.net/eng/docs/rawsettings af854a3a-2127-422b-91ae-364da2661108
- https://winscp.net/tracker/1943 af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗