{"id":"CVE-2021-20286","aliases":["ALPINE-CVE-2021-20286","AZL-7265","DEBIAN-CVE-2021-20286","EUVD-2021-7714","GHSA-r4rf-vx7w-8692","SUSE-SU-2021:2274-1","UBUNTU-CVE-2021-20286","openSUSE-SU-2021:2274-1","openSUSE-SU-2024:10961-1"],"status":"published","title":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may...","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","severity":{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01136,"percentile":0.66793,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-617"],"published":"2021-03-15T17:38:46Z","modified":"2026-11-03T06:32:26Z","fixes":[{"ecosystem":"Alpine:v3.20","package":"libnbd","fixed_in":["1.10.5-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"libnbd","fixed_in":["1.10.5-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"libnbd","fixed_in":["1.10.5-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"libnbd","fixed_in":["1.10.5-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"libnbd","fixed_in":["1.10.5-r0"],"sources":["osv"]},{"ecosystem":"Azure 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15.3","package":"kubevirt","fixed_in":["0.40.0-5.11.2"],"sources":["osv"]},{"ecosystem":"openSUSE:Tumbleweed","package":"libnbd","fixed_in":["1.9.3-1.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.20","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.5-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.5-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.5-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.5-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.24","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.5-r0"}]}]},{"source":"osv","ecosystem":"Azure Linux:2","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.12.1-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.2-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.2-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.2-1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Containers 15 SP2","package":"containerized-data-importer","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.30.0-5.3.2"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Containers 15 SP2","package":"kubevirt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.40.0-5.11.2"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Module for Containers 15 SP3","package":"kubevirt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.40.0-5.11.2"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.3-1","1.2.1-2","1.2.2-1ubuntu2"]},{"source":"osv","ecosystem":"openSUSE:Leap 15.3","package":"kubevirt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.40.0-5.11.2"}]}]},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"libnbd","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.9.3-1.2"}]}]}],"products":[{"vendor":"red hat","product":"libnbd"},{"vendor":"redhat","product":"enterprise_linux"},{"vendor":"redhat","product":"libnbd"}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=1934727","tags":["x_refsource_MISC","x_transferred","Issue Tracking","Third Party Advisory","report"]},{"url":"https://gitlab.com/nbdkit/libnbd/-/commit/fb4440de9cc76e9c14bd3ddf3333e78621f40ad0","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20286","tags":["web"]},{"url":"https://github.com/advisories/GHSA-r4rf-vx7w-8692"},{"url":"https://security.alpinelinux.org/vuln/CVE-2021-20286","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-20286","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2021/suse-su-20212274-1/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2021-20286","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-20286","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-20286","tags":["report"]},{"url":"https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/BNYSQCMH37A42AG5LXPHSQQ6STSS3ZPT/","tags":["advisory"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2021-20286","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T17:38:46Z","modified":"2024-08-03T17:37:23.639Z","cwes":["CWE-617"],"updated_at":"2026-11-02T14:32:55.564736Z"}],"euvd":[{"id":"EUVD-2021-7714","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T17:38:46Z","modified":"2024-08-03T17:37:23Z","updated_at":"2026-11-03T03:25:09.355483Z"}],"ghsa":[{"id":"GHSA-r4rf-vx7w-8692","title":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may...","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2022-05-24T17:44:33Z","modified":"2023-01-29T05:06:04Z","cwes":["CWE-617"],"updated_at":"2026-11-02T14:45:56.147373Z"}],"nvd":[{"id":"CVE-2021-20286","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T18:15:17.783Z","modified":"2026-06-17T03:33:36.57Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-617"],"updated_at":"2026-11-02T14:06:50.805771Z"}],"osv":[{"id":"ALPINE-CVE-2021-20286","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T18:15:17.783Z","modified":"2026-11-03T06:32:26.87983477Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-03T07:17:57.723967Z"},{"id":"AZL-7265","title":"CVE-2021-20286 affecting package libnbd for versions less than 1.12.1-1","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T18:15:17Z","modified":"2026-04-21T04:36:46.899531Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:28:09.201912Z"},{"id":"CVE-2021-20286","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T18:15:17.783Z","modified":"2026-10-24T14:51:03.378956035Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:44:18.004149Z"},{"id":"DEBIAN-CVE-2021-20286","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T18:15:17.783Z","modified":"2026-10-23T18:03:24.608835023Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:45:34.637046Z"},{"id":"UBUNTU-CVE-2021-20286","description":"A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go in ilb/opt.c may lead to denial of service.","status":"published","published":"2021-03-15T18:15:00Z","modified":"2026-04-22T12:45:57.299331Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L","level":"low"}],"updated_at":"2026-11-02T15:54:25.728622Z"},{"id":"openSUSE-SU-2021:2274-1","title":"Security update for kubevirt","description":"This update for kubevirt fixes the following issues:\n\nGeneral:\n\n- Updated kubevirt to version 0.40.0\n- Fixed an issue when calling `virsh-domcapabilities`\n- Fixed the the wrong registry path for containers.\n\nSecurity fixes:\n\n- CVE-2021-20286: A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go\n  in ilb/opt.c may lead to denial of service.\n","status":"published","published":"2021-07-11T07:30:34Z","modified":"2026-02-04T04:08:57.011277Z","updated_at":"2026-11-02T16:58:32.266854Z"},{"id":"openSUSE-SU-2024:10961-1","title":"libnbd-1.9.3-1.2 on GA media","description":"These are all security issues fixed in the libnbd-1.9.3-1.2 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2026-02-04T03:39:43.340366Z","updated_at":"2026-11-02T16:58:34.894275Z"},{"id":"SUSE-SU-2021:2274-1","title":"Security update for kubevirt","description":"This update for kubevirt fixes the following issues:\n\nGeneral:\n\n- Updated kubevirt to version 0.40.0\n- Fixed an issue when calling `virsh-domcapabilities`\n- Fixed the the wrong registry path for containers.\n\nSecurity fixes:\n\n- CVE-2021-20286: A flaw was found in libnbd 1.7.3. An assertion failure in nbd_unlocked_opt_go\n  in ilb/opt.c may lead to denial of service.\n","status":"published","published":"2021-07-09T05:34:06Z","modified":"2026-02-04T03:37:49.121834Z","updated_at":"2026-11-02T15:53:49.138643Z"}]}}