{"schema_version":"1.7.5","id":"CVE-2021-3671","published":"2021-10-12T18:15:08.357Z","modified":"2026-07-09T01:31:20.186871Z","related":["openSUSE-SU-2023:0019-1","openSUSE-SU-2023:0020-1","openSUSE-SU-2024:12580-1"],"details":"A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server.","affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/heimdal/heimdal","events":[{"introduced":"0"},{"fixed":"04171147948d0a3636bc6374181926f0fb2ec83a"}],"database_specific":{"source":"REFERENCES"}}],"versions":["heimdal-1.3.0pre1","git2svn-syncpoint-master","heimdal-1.5pre2","heimdal-1.5pre1","upstream-1.4.0+git20110220.dfsg.1","upstream-1.4.0+git20101228.dfsg.1","heimdal-1.3.0rc1","heimdal-1.3.0pre11","heimdal-1.3.0pre10","heimdal-1.3.0pre9","heimdal-1.3.0pre8","heimdal-1.3.0pre7","heimdal-1.3.0pre6","heimdal-1.3.0pre5","heimdal-1.3.0pre4","heimdal-1.3.0pre3","switch-from-svn-to-git"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3671.json","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["71814477620078668530731684481303091670","284346098059572621942400253662874014995","63355110677909982606625851675836965070","200771017170665811656047669952130469804"],"threshold":0.9},"id":"CVE-2021-3671-5f6e87fc","signature_type":"Line","signature_version":"v1","source":"https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a","target":{"file":"kdc/krb5tgs.c"}},{"deprecated":false,"digest":{"function_hash":"332444689167320886733846614105216309617","length":21025},"id":"CVE-2021-3671-e212c18a","signature_type":"Function","signature_version":"v1","source":"https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a","target":{"file":"kdc/krb5tgs.c","function":"tgs_build_reply"}}],"vanir_signatures_modified":"2026-07-09T01:31:20Z"}},{"ranges":[{"type":"GIT","repo":"https://github.com/samba-team/samba","events":[{"introduced":"0"},{"fixed":"aa756f3f9fc88bbd10c6a3a7c1827ca09a669714"},{"introduced":"9b49519cae3e967af9ea48dc5fcfb6c145e31db4"},{"fixed":"d1c9330fa69ba6942ab23843e21acc11767d54ee"}],"database_specific":{"cpe":"cpe:2.3:a:samba:samba:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"4.13.12"},{"introduced":"4.14.0"},{"fixed":"4.14.8"}],"source":"CPE_RANGE"}}],"versions":["samba-4.13.11","samba-4.14.7","samba-4.13.10","samba-4.14.6","samba-4.14.5","samba-4.13.9","samba-4.14.3","samba-4.13.5","samba-4.14.0","samba-4.13.4","samba-4.13.3","samba-4.13.2","samba-4.13.0","samba-4.13.0rc6","samba-4.13.0rc5","samba-4.13.0rc4","samba-4.13.0rc3","samba-4.13.0rc2","samba-4.13.0rc1","ldb-2.2.0","ldb-2.1.1","samba-4.12.0rc1","ldb-2.1.0","tevent-0.10.2","tdb-1.4.3","talloc-2.3.1","tevent-0.10.1","tdb-1.4.2","talloc-2.3.0","samba-4.11.0rc1","ldb-2.0.5","tdb-1.4.1","ldb-1.6.3","tevent-0.10.0","talloc-2.2.0","tdb-1.4.0","ldb-1.6.2","tevent-0.9.39","talloc-2.1.16","tdb-1.3.18","ldb-1.6.1","samba-4.10.0rc1","ldb-1.5.2","tevent-0.9.38","talloc-2.1.15","tdb-1.3.17","ldb-1.5.1","ldb-1.5.0","samba-4.9.0rc1","ldb-1.4.1","talloc-2.1.14","tdb-1.3.16","tevent-0.9.37","ldb-1.4.0","talloc-2.1.13","talloc-2.1.12","ldb-1.3.2","tevent-0.9.36","samba-4.8.0rc1","ldb-1.3.1","tevent-0.9.35","talloc-2.1.11","tevent-0.9.34","ldb-1.3.0","ldb-1.2.2","tdb-1.3.15","ldb-1.2.1","tevent-0.9.33","talloc-2.1.10","samba-4.7.0rc1","ldb-1.2.0","tdb-1.3.14","tevent-0.9.32","ldb-1.1.31","ldb-1.1.30","tdb-1.3.13","talloc-2.1.9","samba-4.6.0rc1","ldb-1.1.29","tdb-1.3.12","ldb-1.1.28","tevent-0.9.31","tdb-1.3.11","tevent-0.9.30","samba-4.5.0rc1","ldb-1.1.27","tevent-0.9.29","talloc-2.1.8","tdb-1.3.10","talloc-2.1.7","tdb-1.3.9","talloc-2.1.6","tevent-0.9.28","ldb-1.1.26","tevent-0.9.27","samba-4.4.0rc1","ldb-1.1.25","ldb-1.1.23","talloc-2.1.5","tdb-1.3.8","tevent-0.9.26","ldb-1.1.22","talloc-2.1.4","samba-4.3.0rc1","ldb-1.1.21","tdb-1.3.7","talloc-2.1.3","tdb-1.3.6","tevent-0.9.25","tdb-1.3.5","talloc-2.1.2","tevent-0.9.24","tevent-0.9.23","ldb-1.1.20","ldb-1.1.19","tdb-1.3.4","tdb-1.3.3","ldb-1.1.18","tdb-1.3.2","samba-4.2.0rc1","tevent-0.9.22","tdb-1.3.1","tdb-1.3.0","talloc-2.1.1","ldb-1.1.17","tdb-1.2.13","tevent-0.9.21","tevent-0.9.20","talloc-2.1.0","tevent-0.9.19","ldb-1.1.16","tdb-1.2.12","tevent-0.9.18","ldb-1.1.15","ldb-1.1.14","tdb-1.2.11","talloc-2.0.8","samba-4.0.0rc1","ldb-1.1.13","samba-4.0.0beta8","ldb-1.1.12","ldb-1.1.11","samba-4.0.0beta7","tevent-0.9.17","samba-4.0.0beta6","ldb-1.1.10","ldb-1.1.9","samba-4.0.0beta5","samba-4.0.0beta4","ldb-1.1.8","samba-4.0.0beta3","samba-4.0.0beta2","tevent-0.9.16","samba-4.0.0beta1","samba-4.0.0alpha21","samba-4.0.0alpha20","ldb-1.1.6","samba-4.0.0alpha19","ldb-1.1.5","tdb-1.2.10","samba-4.0.0alpha18","tevent-0.9.15","ldb-1.1.4","ldb-1.1.3","talloc-2.0.7","samba-4.0.0alpha17","tevent-0.9.14","ldb-1.1.2","tevent-0.9.13","tevent-0.9.12","ldb-1.1.0","tevent-0.9.11","tdb-1.2.1","samba-4.0.0alpha10","samba-4.0.0alpha9","tdb-1.2.0","tevent-0.9.8","talloc-2.0.0","samba-4.0.0alpha8","talloc-1.3.1","tdb-1.1.5","samba-4.0.0alpha7","samba-4.0.0alpha6"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3671.json"}}],"references":[{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/11/msg00034.html"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20221215-0002/"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20230216-0008/"},{"type":"ADVISORY","url":"https://www.debian.org/security/2022/dsa-5287"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2013080%2C"},{"type":"REPORT","url":"https://bugzilla.samba.org/show_bug.cgi?id=14770%2C"},{"type":"FIX","url":"https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a"}],"database_specific":{"unresolved_ranges":[{"cpes":["cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*"],"extracted_events":[{"introduced":"10.0"},{"last_affected":"10.0"},{"introduced":"11.0"},{"last_affected":"11.0"}],"source":"CPE_STRING","vendor_product":"debian:debian_linux"}]},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}