NULL Pointer Dereference The advisory has been revoked - it doesn't affect any version of package samba (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2510-SAMBA-15735444
- published21 Mar 2026
- disclosed12 Oct 2021
Introduced: 12 Oct 2021
CVE-2021-3671 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:25.10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream samba package and not the samba package as distributed by Ubuntu.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2021-3671
- https://bugzilla.redhat.com/show_bug.cgi?id=2013080,
- https://bugzilla.samba.org/show_bug.cgi?id=14770,
- https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a
- https://bugzilla.redhat.com/show_bug.cgi?id=2013080%2C
- https://bugzilla.samba.org/show_bug.cgi?id=14770%2C
- https://lists.debian.org/debian-lts-announce/2022/11/msg00034.html
- https://security.netapp.com/advisory/ntap-20221215-0002/
- https://security.netapp.com/advisory/ntap-20230216-0008/
- https://www.debian.org/security/2022/dsa-5287