CVE-2018-16860: Heimdal Project Heimdal

High severity, CVSS 7.5. EPSS: 2.5% chance of exploitation in the next 30 days.

A flaw was found in samba's Heimdal KDC implementation, versions 4.8.x up to, excluding 4.8.12, 4.9.x up to, excluding 4.9.8 and 4.10.x up to, excluding 4.10.3, when used in AD DC mode. A man in the middle attacker could use this flaw to intercept the request to the KDC and replace the user name (principal) in the request with any desired user name (principal) that exists in the KDC effectively obtaining a ticket for that principal.

Affected products

• Heimdal Project Heimdal: from 0.8, up to and including 7.5.0
• Samba Samba: from 4.8.0, before 4.8.12 (fixed in 4.8.12); from 4.9.0, before 4.9.8 (fixed in 4.9.8); from 4.10.0, before 4.10.3 (fixed in 4.10.3)

Published 2019-07-31. Last modified 2026-06-17.