CVE-2016-2123

Name: CVE-2016-2123
Creator: NVD / NIST
Published: 2018-11-01T13:29:00.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 6.23%

Last modified Jun 17, 2026

CVE-2016-2123 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. A flaw was found in samba versions 4.0.0 to 4.5.2. The Samba routine ndr_pull_dnsp_name contains an integer wrap problem, leading to an attacker-controlled memory overwrite. EPSS estimates a 6.23% chance of exploitation in the next 30 days.

Description

A flaw was found in samba versions 4.0.0 to 4.5.2. The Samba routine ndr_pull_dnsp_name contains an integer wrap problem, leading to an attacker-controlled memory overwrite. ndr_pull_dnsp_name parses data from the Samba Active Directory ldb database. Any user who can write to the dnsRecord attribute over LDAP can trigger this memory corruption. By default, all authenticated LDAP users can write to the dnsRecord attribute on new DNS objects. This makes the defect a remote privilege escalation.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

6.23%

92.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.0.0, <= 4.0.26
Samba	Samba	>= 4.1.0, <= 4.1.23
Samba	Samba	>= 4.2.0, <= 4.2.14
Samba	Samba	>= 4.3.0, < 4.3.13
Samba	Samba	>= 4.4.0, < 4.4.8
Samba	Samba	>= 4.5.0, < 4.5.3

References

http://www.securityfocus.com/bid/94970Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037493Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2123Issue Tracking
https://www.samba.org/samba/security/CVE-2016-2123.htmlPatch, Vendor Advisory
http://www.securityfocus.com/bid/94970Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037493Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-2123Issue Tracking
https://www.samba.org/samba/security/CVE-2016-2123.htmlPatch, Vendor Advisory

Timeline

Published: Nov 1, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-2123?

How severe is CVE-2016-2123?

CVE-2016-2123 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 6.23% probability of exploitation in the next 30 days.

How do I fix CVE-2016-2123?

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-2016-2123?

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

Scan your code now

Source: NVD / NIST