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CVE-2025-71263

7.4 · HIGH

In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the 'password' variable having a fixed size of 100 bytes.

Published Mar 13, 2026CWE-120EPSS 0.19%

Overview

CVE-2025-71263 is a high-severity vulnerability. It was published on March 13, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to the 'password' variable having a fixed size of 100 bytes. A local user can exploit this to gain root privileges. It is unlikely that UNIX v4 is running anywhere outside of a very small number of lab environments. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.

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

Refdiscuss.systems/@ricci/115747843169814700Refsigma-star.at/blog/2025/12/unix-v4-buffer-overflow/Refwww.spinellis.gr/blog/20251223/Refwww.tuhs.org/pipermail/tuhs/2026-January/032991.htmlRefwww.openwall.com/lists/oss-security/2026/03/20/6Refwww.openwall.com/lists/oss-security/2026/03/21/4

How CyberStrike helps

Frequently asked questions

What is CVE-2025-71263?

CVE-2025-71263 is a high-severity vulnerability. It was published on March 13, 2026 and has a CVSS 3.1 base score of 7.4 (HIGH).

How severe is CVE-2025-71263?

This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-71263?

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-2025-71263?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-71263 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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