CVE-2018-16853

samba: S4U2Self crash with MIT KDC build

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Severity

Important

Red Hat Product Security

7.5

CVSS 3.0

Review impact separately from score.

Published · November 28, 2018

Updated · November 22, 2025

Description

Samba versions 4.7 and later, built with MIT Kerberos support, are vulnerable to a crash via the S4U2self extension. A user in a Samba Active Directory domain can crash the KDC when Samba is built in the non-default MIT Kerberos configuration.

Statement

This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux because there is no support for samba as Active Directory Domain Controller.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 7.5
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-400 · Uncontrolled Resource Consumption