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Vulnerability record · CVE-2016-2123 · published 1 November 2018

CVE-2016-2123: Samba heap-based buffer overflow vulnerability

Samba · Samba

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.

8.8 CVSS 3.1 High EPSS 6.2% · top 6.7% CWE-122 · Heap-based buffer overflowCWE-119 · Memory buffer overflow
8.8CVSS 3.1 base score, v2 6.5
6.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2016-2123), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.