CVE-2025-71263

HighCVSS 7.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-120

Affected software

VendorProductVersions
AT&T Bell LabsUNIX4

References

Timeline

Published
Mar 13, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2025-71263: High severity, CVSS 7.8 | Vulnix