What is CVE-2016-2110?

CVE-2016-2110 is a medium-severity vulnerability in Samba, classified under CWE-254. CVSS score: 5.9/10. Published 2016-04-25.

How severe is CVE-2016-2110?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Is CVE-2016-2110 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Samba

CVE-2016-2110

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.

Published 2016-04-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.083 (94.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.083 · newest: 0.083 · change: 0.000

Affected products

Samba — versions 3.0.0, 3.0.1, 3.0.2
Canonical Ubuntu Linux — versions 14.04, 15.10, 16.04

Weakness classification (CWE)

CWE-254

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

www.slackware.com/security/viewer.php (vendor-advisory)
lists.opensuse.org/opensuse-security-announce/2016-04/msg00020.html (vendor-advisory)
rhn.redhat.com/errata/RHSA-2016-0612.html (vendor-advisory)
lists.opensuse.org/opensuse-updates/2016-05/msg00124.html (vendor-advisory)
www.ubuntu.com/usn/USN-2950-1 (vendor-advisory)
lists.opensuse.org/opensuse-security-announce/2016-04/msg00024.html (vendor-advisory)
rhn.redhat.com/errata/RHSA-2016-0613.html (vendor-advisory)
badlock.org/
rhn.redhat.com/errata/RHSA-2016-0621.html (vendor-advisory)
www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html

Frequently asked questions

What is CVE-2016-2110?: CVE-2016-2110 is a medium-severity vulnerability in Samba, classified under CWE-254. CVSS score: 5.9/10. Published 2016-04-25.
How severe is CVE-2016-2110?: Medium severity. CVSS v3 base score is 5.9 out of 10.
Is CVE-2016-2110 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.