CVE-2021-3331 json
WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads sessio…
published 2021-01-27 5 y ago modified 2026-10-08 31 d ago also EUVD-2021-26662
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 7.7%
- EPSS 7.7% chance of exploitation in 30 days, percentile 94%
- public exploits
- 0
- none known
Summary
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.)
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 31 d ago
Exploit prediction
7.70% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 10.0 | AV:N/AC:L/Au:N/C:C/I:C/A:C |
References
-
github.com
/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d
patch, third-party-advisory
-
winscp.net
/tracker/1943
patch, vendor-advisory
-
winscp.net
/eng/docs/history#5.17.10
release-notes, vendor-advisory
-
winscp.net
/eng/docs/rawsettings
vendor-advisory
Sources
- CVE List CVE-2021-3331
- NVD CVE-2021-3331
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.