CVE-2025-71263

HIGH EPSS 7.6%
Published Mar 13, 20263mo ago · Modified Jun 17, 20262w ago
7.8 CVSS 3.1
High
Find Similar
Published Mar 13, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
7.6% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-120

Affected Products 1

VendorProductVersionRange
opengroupunix4any

References 6

  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/20/6
    Issue TrackingMailing List
  • openwall.com http://www.openwall.com/lists/oss-security/2026/03/21/4
    Issue TrackingMailing List
  • discuss.systems https://discuss.systems/@ricci/115747843169814700
    Issue Tracking
  • sigma-star.at https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/
    Press/Media Coverage
  • spinellis.gr https://www.spinellis.gr/blog/20251223/
    Technical Description
  • tuhs.org https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html
    Issue TrackingMailing List

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.