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CVE-2025-71263

HIGH

7.4

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.

CVE Details

CVSS v3.1 Score7.4

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityHIGH

Privileges RequiredNONE

User InteractionNONE

Published3/13/2026

Last Modified3/21/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-120

References

https://discuss.systems/@ricci/115747843169814700(cve@mitre.org)

https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/(cve@mitre.org)

https://www.spinellis.gr/blog/20251223/(cve@mitre.org)

https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html(cve@mitre.org)

http://www.openwall.com/lists/oss-security/2026/03/20/6(af854a3a-2127-422b-91ae-364da2661108)

http://www.openwall.com/lists/oss-security/2026/03/21/4(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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