CVE-2025-71263 HIGH

CVE-2025-71263

Vendor At&T Bell Labs
Product UNIX
Weakness CWE-120
Published March 13, 2026
Last update March 21, 2026

CVSS base score

7.4/10
Attack vector Local
Attack complexity High
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 13, 2026 CVE published
March 21, 2026 Record updated