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. (For example, this is exploitable in a default installation in which WinSCP is the handler for sftp:// URLs.)

CVSS 3.1

9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

7.7% chance of exploitation in the next 30 days; higher than 94% of CVEs (scores of 2026-10-25)

Published

2021-01-27

Modified

2026-10-08

Record from

the NVD, synced 2026-10-19

Affected

• winscp:winscp

References

• https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d
• https://winscp.net/eng/docs/history#5.17.10
• https://winscp.net/eng/docs/rawsettings
• https://winscp.net/tracker/1943
• https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d

Check your stackJSON