CVE-2021-3671

low

Published — · Modified —

CVSS v3

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CVSS v2

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VIR risk

2.5

Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2021-3671

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2021-3671.html

OS impact

OS	Version	Status	Fixed in
arch		fixed	`4.15.0-1`
sles		affected
debian	bookworm	fixed	`7.7.0+dfsg-3`
debian	bullseye	fixed	`7.7.0+dfsg-2+deb11u2`
debian	forky	fixed	`7.7.0+dfsg-3`
debian	sid	fixed	`7.7.0+dfsg-3`
debian	trixie	fixed	`7.7.0+dfsg-3`

References

https://www.suse.com/security/cve/CVE-2021-3671.html
https://security-tracker.debian.org/tracker/CVE-2021-3671

Verify integrity in audit chain (admin only). AS-IS.