CVE-2025-71263

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Summary

CVECVE-2025-71263
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-13 19:53:53 UTC
Updated2026-06-11 21:09:17 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001790000 probability, percentile 0.076030000 (date 2026-06-18)

Problem Types: CWE-120 | CWE-120 CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.4HIGHCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Opengroup Unix 4 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA ATT Bell Labs UNIX affected 4 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/03/21/4 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Issue Tracking, Mailing List
www.tuhs.org/pipermail/tuhs/2026-January/032991.html [email protected] www.tuhs.org Issue Tracking, Mailing List
sigma-star.at/blog/2025/12/unix-v4-buffer-overflow [email protected] sigma-star.at Press/Media Coverage
discuss.systems/@ricci/115747843169814700 [email protected] discuss.systems Issue Tracking
www.spinellis.gr/blog/20251223 [email protected] www.spinellis.gr Technical Description
www.openwall.com/lists/oss-security/2026/03/20/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Issue Tracking, Mailing List
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