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CVE-2025-71263

Published: Mar 13, 2026Updated: Jun 11, 2026 Sources: CVE List NVDCWE-120
7.4HIGH
NVD MITRE
EPSS Score
0.2%
Top 92.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:HPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-120

Affected Products

AT&T Bell Labs
commercial·US
UNIXOn-prem
Operating Systems / unix-bsd
opengroup
oss-projectaka common desktop environment, archi
unixOn-prem
Operating Systems / linux-distro

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/
sigma-star.at
https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html
tuhs.org
https://discuss.systems/@ricci/115747843169814700
discuss.systems
and 3 more references View all →

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