CVE-2017-12151: Debian Linux

High severity, CVSS 7.4. EPSS: 4.1% chance of exploitation in the next 30 days.

A flaw was found in the way samba client before samba 4.4.16, samba 4.5.14 and samba 4.6.8 used encryption with the max protocol set as SMB3. The connection could lose the requirement for signing and encrypting to any DFS redirects, allowing an attacker to read or alter the contents of the connection via a man-in-the-middle attack.

Affected products

• Debian Debian Linux: version 8.0 only; version 9.0 only
• HP Cifs Server: version b.04.05.11.00 only
• Red Hat Enterprise Linux: version 7.0 only
• Red Hat Enterprise Linux Desktop: version 7.0 only
• Red Hat Enterprise Linux Server Aus: version 7.4 only
• Red Hat Enterprise Linux Server Eus: version 7.4 only; version 7.5 only
• Red Hat Enterprise Linux Workstation: version 7.0 only
• Samba Samba: before 4.4.16 (fixed in 4.4.16); from 4.5.0, before 4.5.14 (fixed in 4.5.14); from 4.6.0, before 4.6.8 (fixed in 4.6.8)

Published 2018-07-27. Last modified 2026-06-17.