CVE-2016-2110: Canonical Ubuntu Linux

Medium severity, CVSS 5.9. EPSS: 8.3% chance of exploitation in the next 30 days.

The NTLMSSP authentication implementation in Samba 3.x and 4.x before 4.2.11, 4.3.x before 4.3.8, and 4.4.x before 4.4.2 allows man-in-the-middle attackers to perform protocol-downgrade attacks by modifying the client-server data stream to remove application-layer flags or encryption settings, as demonstrated by clearing the NTLMSSP_NEGOTIATE_SEAL or NTLMSSP_NEGOTIATE_SIGN option to disrupt LDAP security.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 15.10 only; version 16.04 only
• Samba Samba: version 3.0.0 only; version 3.0.1 only; version 3.0.2 only; version 3.0.2a only; version 3.0.3 only; version 3.0.4 only; …

Published 2016-04-25. Last modified 2026-06-17.