Vulnerability in Winscp
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.)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.077 (94.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.076 · newest: 0.077 · change: +0.001
Affected products
Public proof-of-concept exploits
References
- winscp.net/eng/docs/history (Release Notes, Vendor Advisory)
- winscp.net/tracker/1943 (Patch, Vendor Advisory)
- github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d (Patch, Third Party Advisory)
- winscp.net/eng/docs/rawsettings (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-3331?
- CVE-2021-3331 is a critical-severity vulnerability in Winscp. CVSS score: 9.8/10. Published 2021-01-27.
- How severe is CVE-2021-3331?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-3331 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.