CVE-2021-3331
WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings.
Does this matter?
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.
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.)
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 7.70% probability · 95th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- winscp/winscp
- Source
- cve@mitre.org
EPSS 7.7% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688dPatch, Third Party Advisory
- https://winscp.net/eng/docs/history#5.17.10Release Notes, Vendor Advisory
- https://winscp.net/eng/docs/rawsettingsVendor Advisory
- https://winscp.net/tracker/1943Patch, Vendor Advisory
- https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688dPatch, Third Party Advisory
- https://winscp.net/eng/docs/history#5.17.10Release Notes, Vendor Advisory
- https://winscp.net/eng/docs/rawsettingsVendor Advisory
- https://winscp.net/tracker/1943Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.