CVEvulnerability
CVE-2025-71263
7.8 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-03-13
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.4 HIGH — CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CVSS 3.1 ([email protected])
- 7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-120
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.
Affected configurations
• opengroup unix 4
Related
Weakness · CWE (1)
- CWE-120 Buffer Copy without Checking Size of Input weakness
References
- https://discuss.systems/@ricci/115747843169814700 Issue Tracking
- https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/ Press/Media Coverage
- https://www.spinellis.gr/blog/20251223/ Technical Description
- https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html Issue Tracking, Mailing List
- http://www.openwall.com/lists/oss-security/2026/03/20/6 Issue Tracking, Mailing List
- http://www.openwall.com/lists/oss-security/2026/03/21/4 Issue Tracking, Mailing List