CVE-2016-2126

Name: CVE-2016-2126
Creator: NVD / NIST
Published: 2017-05-11T14:29:58.077+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 6.59%

Last modified Jun 17, 2026

CVE-2016-2126 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. EPSS estimates a 6.59% chance of exploitation in the next 30 days.

Description

Samba version 4.0.0 up to 4.5.2 is vulnerable to privilege elevation due to incorrect handling of the PAC (Privilege Attribute Certificate) checksum. A remote, authenticated, attacker can cause the winbindd process to crash using a legitimate Kerberos ticket. A local service with access to the winbindd privileged pipe can cause winbindd to cache elevated access permissions.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

6.59%

93.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-264

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.0.0, < 4.3.13
Samba	Samba	>= 4.4.0, < 4.4.8
Samba	Samba	>= 4.5.0, < 4.5.3

References

http://rhn.redhat.com/errata/RHSA-2017-0494.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0495.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0662.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0744.htmlThird Party Advisory
http://www.securityfocus.com/bid/94994Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037495Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:1265Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2126.htmlVendor Advisory
http://rhn.redhat.com/errata/RHSA-2017-0494.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0495.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0662.htmlThird Party Advisory
http://rhn.redhat.com/errata/RHSA-2017-0744.htmlThird Party Advisory
http://www.securityfocus.com/bid/94994Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037495Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2017:1265Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA43730Third Party Advisory
https://www.samba.org/samba/security/CVE-2016-2126.htmlVendor Advisory

Timeline

Published: May 11, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-2126?

How severe is CVE-2016-2126?

CVE-2016-2126 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 6.59% probability of exploitation in the next 30 days.

How do I fix CVE-2016-2126?

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-2016-2126?

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

Scan your code now

Source: NVD / NIST