CVE-2018-16857: Samba

Medium severity, CVSS 5.9. EPSS: 2.3% chance of exploitation in the next 30 days.

Samba from version 4.9.0 and before version 4.9.3 that have AD DC configurations watching for bad passwords (to restrict brute forcing of passwords) in a window of more than 3 minutes may not watch for bad passwords at all. The primary risk from this issue is with regards to domains that have been upgraded from Samba 4.8 and earlier. In these cases the manual testing done to confirm an organisation's password policies apply as expected may not have been re-done after the upgrade.

Affected products

• Samba Samba: from 4.9.0, before 4.9.3 (fixed in 4.9.3)

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