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CVE-2025-71263

Quick assessment

Affected
AT&T Bell Labs UNIX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AT&T Bell Labs UNIX是美国AT&T公司的一个类Unix操作系统。 AT&T Bell Labs UNIX v4版本存在安全漏洞，该漏洞源于password变量存在缓冲区溢出，可能导致本地用户获得root权限。

CVSS 7.4 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2025-71263

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
AT&T Bell Labs UNIX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
AT&T Bell Labs UNIX是美国AT&T公司的一个类Unix操作系统。 AT&T Bell Labs UNIX v4版本存在安全漏洞，该漏洞源于password变量存在缓冲区溢出，可能导致本地用户获得root权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
AT&T Bell Labs UNIX 4 -

II. Public POCs for CVE-2025-71263

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III. Intelligence Information for CVE-2025-71263

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Mailing List Discussions for CVE-2025-71263 (1)

Security Blog Posts for CVE-2025-71263 (3)

IV. Related Vulnerabilities

Same weakness: CWE-120

V. Comments for CVE-2025-71263

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