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CVE-2025-71263

High

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.

SeverityHigh
CVSS7.4
Exploit probability9. percentile0.2%
ProductOpengroup Unix
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-120CWE-120

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

ProductAffected versionsFixed in
opengroup unix4—

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