{"id":"CVE-2021-31871","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-31871","generatedAt":"2026-10-27T22:34:04.339Z","title":"An integer overflow in the cpio command may result in a NULL pointer dereference on 64-bit systems.","description":"An issue was discovered in klibc before 2.0.9. An integer overflow in the cpio command may result in a NULL pointer dereference on 64-bit systems.","published":"2021-04-30T06:15:07.000Z","lastModified":"2026-06-17T03:52:23.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-190"],"affected":["klibc project/klibc","debian/debian linux"],"epss":{"score":0.01875,"percentile":0.79253,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (1.88%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"http://www.openwall.com/lists/oss-security/2021/04/30/1","tags":["Mailing List","Release Notes","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=2e48a12ab1e30d43498c2d53e878a11a1b5102d5","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://kernel.org/pub/linux/libs/klibc/2.0/","tags":["Release Notes","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00025.html","tags":["Mailing List","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://lists.zytor.com/archives/klibc/2021-April/004593.html","tags":["Mailing List","Release Notes","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"http://www.openwall.com/lists/oss-security/2021/04/30/1","tags":["Mailing List","Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=2e48a12ab1e30d43498c2d53e878a11a1b5102d5","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kernel.org/pub/linux/libs/klibc/2.0/","tags":["Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00025.html","tags":["Mailing List","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://lists.zytor.com/archives/klibc/2021-April/004593.html","tags":["Mailing List","Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-31871","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}