{"schemaVersion":3,"id":"CVE-2021-31872","aliases":["UBUNTU-CVE-2021-31872","DEBIAN-CVE-2021-31872"],"status":"published","duplicateOf":null,"title":null,"description":"An issue was discovered in klibc before 2.0.9. Multiple possible integer overflows in the cpio command on 32-bit systems may result in a buffer overflow or other security impact.","dates":{"published":"2021-04-30T05:19:04.000Z","modified":"2024-08-03T23:10:31.023Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":10,"impact":9.8,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":7.5,"severity":"high","vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.02076,"percentile":0.81215,"severity":"low","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.02076},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.02076,"percentile":0.81215}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.02076,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.02076,"percentile":0.81215}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-190","name":"Integer Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"vendor":"debian","product":"klibc","name":"klibc","label":"klibc","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/klibc","purlType":"deb","versions":[{"text":"< 2.0.8-6","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.0.8-6","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"klibc","name":"klibc","label":"klibc","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/klibc","purlType":"deb","versions":[{"text":"< 2.0.3-0ubuntu1.14.04.3+esm2","noFixRecorded":false,"fixedIn":null},{"text":"< 2.0.4-8ubuntu1.16.04.4+esm1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.0.4-9ubuntu2.1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.0.7-1ubuntu5.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.0.3-0ubuntu1.14.04.3+esm2 | < 2.0.4-8ubuntu1.16.04.4+esm1 | < 2.0.4-9ubuntu2.1 | < 2.0.7-1ubuntu5.1","eol":null,"hubHref":null},{"vendor":"debian","product":"debian_linux","name":"debian linux","label":"debian_linux","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"9.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"9.0","eol":{"isEol":true,"eolDate":"2022-07-01T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"9","label":"9 (Stretch)","eolFrom":"2022-07-01T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"9.13"},"product":{"name":"debian","label":"Debian","category":"os"}},"hubHref":"/vendor/debian/debian_linux"},{"vendor":"klibc_project","product":"klibc","name":"klibc","label":"klibc","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"< 2.0.9","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.0.9","eol":null,"hubHref":"/vendor/klibc_project/klibc"}],"affectedCount":4,"eol":{"hasEol":true,"count":1},"references":[{"url":"https://kernel.org/pub/linux/libs/klibc/2.0/","label":"kernel.org/pub/linux/libs/klibc/2.0/","hostname":"kernel.org","tags":["X Refsource MISC","REPORT","Release Notes","Third Party Advisory"]},{"url":"https://lists.zytor.com/archives/klibc/2021-April/004593.html","label":"lists.zytor.com/archives/klibc/2021-April/004593.html","hostname":"lists.zytor.com","tags":["X Refsource MISC","REPORT","Mailing List","Release Notes","Third Party Advisory"]},{"url":"https://git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=9b1c91577aef7f2e72c3aa11a27749160bd278ff","label":"git.kernel.org/pub/scm/libs/klibc/klibc.git/commit/?id=9b1c91577aef7f2e72c3aa11a27749160bd278ff","hostname":"git.kernel.org","tags":["X Refsource MISC","Patch","Third Party Advisory"]},{"url":"http://www.openwall.com/lists/oss-security/2021/04/30/1","label":"www.openwall.com/lists/oss-security/2021/04/30/1","hostname":"www.openwall.com","tags":["Mailing List","X Refsource MLIST","Release Notes","Third Party Advisory"]},{"url":"https://lists.debian.org/debian-lts-announce/2021/06/msg00025.html","label":"lists.debian.org/debian-lts-announce/2021/06/msg00025.html","hostname":"lists.debian.org","tags":["Mailing List","X Refsource MLIST","Third Party Advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-31872","label":"ubuntu.com/security/CVE-2021-31872","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/notices/USN-5379-1","label":"ubuntu.com/security/notices/USN-5379-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-31872","label":"www.cve.org/CVERecord?id=CVE-2021-31872","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-31872","label":"security-tracker.debian.org/tracker/CVE-2021-31872","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["DLA-2695-1","USN-5379-1"],"duplicates":[],"related":["USN-5379-1"]},"timeline":[{"kind":"published","date":"2021-04-30T05:19:04.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2024-08-03T23:10:31.023Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T14:47:26.058Z","stale":false,"partial":false}}