# CVE-2021-3331: WinSCP: WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters…

CVE-2021-3331 is fixed in WinSCP on 1 platform by WinSCP 5.17.10 (version 5.17.10), released January 26, 2021. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-3331
- Priority: Urgent
- CVSS: 9.8
- EPSS: 0.0770
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 27, 2021
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-3331

## 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.)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | WinSCP | 5.17.10 | [WinSCP 5.17.10](https://patchblox.com/security/data/fix/windows-app/winscp.winscp-5.17.10.md) | Jan 26, 2021 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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