CVE-2018-16853

high

Published — · Modified —

CVSS v3

—

CVSS v2

—

VIR risk

8.0

Description

Samba from version 4.7.0 has a vulnerability that allows a user in a Samba AD domain to crash the KDC when Samba is built in the non-default MIT Kerberos configuration. With this advisory the Samba Team clarify that the MIT Kerberos build of the Samba AD DC is considered experimental. Therefore the Samba Team will not issue security patches for this configuration. Additionally, Samba 4.7.12, 4.8.7 and 4.9.3 have been issued as security releases to prevent building of the AD DC with MIT Kerberos unless --with-experimental-mit-ad-dc is specified to the configure command.

Predictions

Exploit likelihood

20%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-16853

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201811-22

OS impact

OS	Version	Status	Fixed in
arch		fixed	`4.9.3-1`
debian	bookworm	fixed	`2:4.9.2+dfsg-2`
debian	bullseye	fixed	`2:4.9.2+dfsg-2`
debian	forky	fixed	`2:4.9.2+dfsg-2`
debian	sid	fixed	`2:4.9.2+dfsg-2`
debian	trixie	fixed	`2:4.9.2+dfsg-2`

References

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