What’s Vulnerable › Vulnerabilities

CVE-2018-16852

• Severity: medium (CVSS 4.4 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-11-28 · updated 2026-06-17
• Weakness: CWE-476

Description

Samba from version 4.9.0 and before version 4.9.3 is vulnerable to a NULL pointer de-reference. During the processing of an DNS zone in the DNS management DCE/RPC server, the internal DNS server or the Samba DLZ plugin for BIND9, if the DSPROPERTY_ZONE_MASTER_SERVERS property or DSPROPERTY_ZONE_SCAVENGING_SERVERS property is set, the server will follow a NULL pointer and terminate. There is no further vulnerability associated with this issue, merely a denial of service.

Affected products

• Samba: from 4.9.0 before 4.9.3 — fixed in 4.9.3

How to fix

Upgrade to a fixed version: Samba 4.9.3. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/106024
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16852
• https://security.gentoo.org/glsa/202003-52
• https://security.netapp.com/advisory/ntap-20181127-0001/
• https://www.samba.org/samba/security/CVE-2018-16852.html
• http://www.securityfocus.com/bid/106024
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16852
• https://security.gentoo.org/glsa/202003-52
• https://security.netapp.com/advisory/ntap-20181127-0001/
• https://www.samba.org/samba/security/CVE-2018-16852.html

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