{"id":"CVE-2025-71263","state":"PUBLISHED","title":"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 th","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.","publishedAt":"2026-03-13T18:38:07.721Z","updatedAt":"2026-03-21T22:00:54.839Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"mitre"},"assigner":"mitre","products":["AT&T Bell Labs UNIX"],"affected":[{"vendor":"AT&T Bell Labs","product":"UNIX","defaultStatus":"unknown","versions":[{"version":"4","status":"affected","versionType":"custom"}]}],"references":["https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/","https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html","https://discuss.systems/@ricci/115747843169814700","https://www.spinellis.gr/blog/20251223/","http://www.openwall.com/lists/oss-security/2026/03/20/6","http://www.openwall.com/lists/oss-security/2026/03/21/4"],"weaknesses":["CWE-120"],"ingestedAt":"2026-10-29T20:10:04.440Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/71xxx/CVE-2025-71263.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-71263","state":"PUBLISHED","datePublished":"2026-03-13T18:38:07.721Z","dateUpdated":"2026-03-21T22:00:54.839Z","assignerShortName":"mitre","assignerOrgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateReserved":"2026-03-13T18:38:07.187Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"AT&T Bell Labs","product":"UNIX","defaultStatus":"unknown","versions":[{"version":"4","status":"affected","versionType":"custom"}]}],"references":[{"url":"https://sigma-star.at/blog/2025/12/unix-v4-buffer-overflow/"},{"url":"https://www.tuhs.org/pipermail/tuhs/2026-January/032991.html"},{"url":"https://discuss.systems/@ricci/115747843169814700"},{"url":"https://www.spinellis.gr/blog/20251223/"}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"mitre","orgId":"8254265b-2729-46b6-b9e3-3dfca2d5bfca","dateUpdated":"2026-03-21T22:00:54.839Z"},"x_generator":{"engine":"CVE-Request-form 0.0.1"},"tags":["unsupported-when-assigned"]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-13T19:36:07.731823Z","id":"CVE-2025-71263","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-13T19:36:17.585Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/03/20/6"},{"url":"http://www.openwall.com/lists/oss-security/2026/03/21/4"}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2026-03-21T19:07:38.428Z"}}]}}}