CVE-2025-71263
- State
- Published
- Severity
- 7.4 High
- Published
- Mar 13, 2026
- Updated
- Mar 21, 2026
- Reserved
- Mar 13, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.4 High | CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | mitre |
Weaknesses
- CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Affected Products
| Product | Versions |
|---|---|
UNIXAT&T Bell Labs |
|
References
- https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/
- https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html
- https://discuss.systems/@ricci/115747843169814700
- https://www.spinellis.gr/blog/20251223/
- http://www.openwall.com/lists/oss-security/2026/03/20/6
- http://www.openwall.com/lists/oss-security/2026/03/21/4
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