CVE Catalog

CVE-2025-71263

HighCVSS 7.4
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.01%

0th percentile - higher than 0% of all known CVEs

Summary

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.

Risk Assessment

The risk to organizations is minimal as UNIX v4 is unlikely to be running outside of a very small number of lab environments.

Recommendation

It is recommended to avoid using UNIX v4 and to migrate to newer, supported versions of the operating system.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS