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Vulnerability record · CVE-2021-3331 · published 27 January 2021

CVE-2021-3331: Winscp vulnerability

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.)

9.8 CVSS 3.1 Critical EPSS 7.6% · top 5.7%
9.8CVSS 3.1 base score, v2 10.0
7.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d PatchThird Party Advisory
https://winscp.net/eng/docs/history#5.17.10 Release NotesVendor Advisory
https://winscp.net/eng/docs/rawsettings Vendor Advisory
https://winscp.net/tracker/1943 PatchVendor Advisory
https://github.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688d PatchThird Party Advisory
https://winscp.net/eng/docs/history#5.17.10 Release NotesVendor Advisory
https://winscp.net/eng/docs/rawsettings Vendor Advisory
https://winscp.net/tracker/1943 PatchVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-3331), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.