{"id":"CVE-2025-71263","aliases":["EUVD-2025-208655","GHSA-86j5-wh4f-79gm"],"status":"published","title":"In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to...","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.","severity":{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00202,"percentile":0.10128,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-120"],"published":"2026-03-13T18:38:07Z","modified":"2026-06-17T10:03:58Z","products":[{"vendor":"at\u0026t bell labs","product":"unix"},{"vendor":"opengroup","product":"unix"}],"references":[{"url":"https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/","tags":["Press/Media Coverage"]},{"url":"https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html","tags":["Issue Tracking","Mailing List"]},{"url":"https://discuss.systems/@ricci/115747843169814700","tags":["Issue Tracking"]},{"url":"https://www.spinellis.gr/blog/20251223/","tags":["Technical Description"]},{"url":"http://www.openwall.com/lists/oss-security/2026/03/20/6","tags":["Issue Tracking","Mailing List"]},{"url":"http://www.openwall.com/lists/oss-security/2026/03/21/4","tags":["Issue Tracking","Mailing List"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-71263"},{"url":"https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow"},{"url":"https://www.spinellis.gr/blog/20251223"},{"url":"https://github.com/advisories/GHSA-86j5-wh4f-79gm"}],"sources":{"cve":[{"id":"CVE-2025-71263","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.","status":"published","published":"2026-03-13T18:38:07.721Z","modified":"2026-03-21T22:00:54.839Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:32:42.751171Z"}],"euvd":[{"id":"EUVD-2025-208655","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.","status":"published","published":"2026-03-13T18:38:07Z","modified":"2026-03-21T22:00:54Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T19:25:31.656142Z"}],"ghsa":[{"id":"GHSA-86j5-wh4f-79gm","title":"In UNIX Fourth Research Edition (v4), the su command is vulnerable to a buffer overflow due to...","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.","status":"published","published":"2026-03-13T21:31:45Z","modified":"2026-03-21T21:31:26Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T15:06:45.979177Z"}],"nvd":[{"id":"CVE-2025-71263","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.","status":"published","published":"2026-03-13T19:53:53.983Z","modified":"2026-06-17T10:03:58.307Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-120"],"updated_at":"2026-11-02T14:12:01.641503Z"}]}}