{"id":"UBUNTU-CVE-2021-27645","details":"The nameserver caching daemon (nscd) in the GNU C Library (aka glibc or libc6) 2.29 through 2.33, when processing a request for netgroup lookup, may crash due to a double-free, potentially resulting in degraded service or Denial of Service on the local system. This is related to netgroupcache.c.","modified":"2026-04-22T14:39:05.830667Z","published":"2021-02-24T15:15:00Z","related":["USN-5310-1"],"upstream":["CVE-2021-27645"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-27645"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5310-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-27645"}],"affected":[{"package":{"name":"glibc","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/glibc@2.31-0ubuntu9.7?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.31-0ubuntu9.7"}]}],"versions":["2.30-0ubuntu2","2.30-0ubuntu3","2.31-0ubuntu5","2.31-0ubuntu6","2.31-0ubuntu7","2.31-0ubuntu9","2.31-0ubuntu9.1","2.31-0ubuntu9.2","2.31-0ubuntu9.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"glibc-source","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc-bin","binary_version":"2.31-0ubuntu9.7"},{"binary_version":"2.31-0ubuntu9.7","binary_name":"libc-dev-bin"},{"binary_name":"libc6","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-amd64","binary_version":"2.31-0ubuntu9.7"},{"binary_version":"2.31-0ubuntu9.7","binary_name":"libc6-armel"},{"binary_name":"libc6-dev-amd64","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-dev-armel","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-dev-i386","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-dev-s390","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-dev-x32","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-i386","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-lse","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-pic","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-prof","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-s390","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"libc6-x32","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"locales","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"locales-all","binary_version":"2.31-0ubuntu9.7"},{"binary_name":"nscd","binary_version":"2.31-0ubuntu9.7"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-27645.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"low"}]}