CVE-2016-2119

Name: CVE-2016-2119
Creator: NVD / NIST
Published: 2016-07-07T15:59:00.133+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.12%

Last modified Jun 17, 2026

CVE-2016-2119 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a client-signing protection mechanism, and consequently spoof SMB2 and SMB3 servers, via the (1) SMB2_SESSION_FLAG_IS_GUEST or (2) SMB2_SESSION_FLAG_IS_NULL flag.. EPSS estimates a 3.12% chance of exploitation in the next 30 days.

Description

libcli/smb/smbXcli_base.c in Samba 4.x before 4.2.14, 4.3.x before 4.3.11, and 4.4.x before 4.4.5 allows man-in-the-middle attackers to bypass a client-signing protection mechanism, and consequently spoof SMB2 and SMB3 servers, via the (1) SMB2_SESSION_FLAG_IS_GUEST or (2) SMB2_SESSION_FLAG_IS_NULL flag.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

3.12%

86.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-94

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.0.0, < 4.2.14
Samba	Samba	>= 4.3.0, < 4.3.11
Samba	Samba	>= 4.4.0, < 4.4.5

References

http://lists.opensuse.org/opensuse-updates/2016-07/msg00060.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1486.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1487.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1494.htmlThird Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlThird Party Advisory
http://www.securityfocus.com/bid/91700Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036244Third Party Advisory, VDB Entry
https://security.gentoo.org/glsa/201805-07Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2119.htmlVendor Advisory
http://lists.opensuse.org/opensuse-updates/2016-07/msg00060.htmlMailing List, Third Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1486.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1487.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2016-1494.htmlThird Party Advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.htmlThird Party Advisory
http://www.securityfocus.com/bid/91700Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1036244Third Party Advisory, VDB Entry
https://security.gentoo.org/glsa/201805-07Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2119.htmlVendor Advisory

Timeline

Published: Jul 7, 2016
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-2119?

How severe is CVE-2016-2119?

CVE-2016-2119 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.12% probability of exploitation in the next 30 days.

How do I fix CVE-2016-2119?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2016-2119?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST