CVE-2018-16853: Samba

Medium severity, CVSS 5.9. EPSS: 3.1% chance of exploitation in the next 30 days.

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.

Affected products

• Samba Samba: from 4.7.0, before 4.7.12 (fixed in 4.7.12); from 4.8.0, before 4.8.7 (fixed in 4.8.7); from 4.9.0, before 4.9.3 (fixed in 4.9.3)

Published 2018-11-28. Last modified 2026-06-17.