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CVE-2021-3331

9.8 · CRITICAL

WinSCP before 5.17.10 allows remote attackers to execute arbitrary programs when the URL handler encounters a crafted URL that loads session settings.

Published Jan 27, 2021EPSS 7.61%

Overview

CVE-2021-3331 is a critical-severity vulnerability. It was published on January 27, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688dRefwinscp.net/eng/docs/history#5.17.10Refwinscp.net/eng/docs/rawsettingsRefwinscp.net/tracker/1943GitHubgithub.com/winscp/winscp/commit/faa96e8144e6925a380f94a97aa382c9427f688dRefwinscp.net/eng/docs/history#5.17.10Refwinscp.net/eng/docs/rawsettingsRefwinscp.net/tracker/1943

How CyberStrike helps

Frequently asked questions

What is CVE-2021-3331?

CVE-2021-3331 is a critical-severity vulnerability. It was published on January 27, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2021-3331?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-3331?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-3331?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-3331 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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