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CVE-2018-16851

6.5 · MEDIUM

Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service.

Published Nov 28, 2018CWE-476EPSS 3.25%

Overview

CVE-2018-16851 is a medium-severity vulnerability. It was published on November 28, 2018 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

Samba from version 4.0.0 and before versions 4.7.12, 4.8.7, 4.9.3 is vulnerable to a denial of service. During the processing of an LDAP search before Samba's AD DC returns the LDAP entries to the client, the entries are cached in a single memory object with a maximum size of 256MB. When this size is reached, the Samba process providing the LDAP service will follow the NULL pointer, terminating the process. There is no further vulnerability associated with this issue, merely a denial of service.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.securityfocus.com/bid/106027Refbugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16851Reflists.debian.org/debian-lts-announce/2018/12/msg00005.htmlRefsecurity.gentoo.org/glsa/202003-52Refsecurity.netapp.com/advisory/ntap-20181127-0001/Refusn.ubuntu.com/3827-1/Refusn.ubuntu.com/3827-2/Refwww.debian.org/security/2018/dsa-4345Refwww.samba.org/samba/security/CVE-2018-16851.htmlRefwww.securityfocus.com/bid/106027

How CyberStrike helps

Frequently asked questions

What is CVE-2018-16851?

CVE-2018-16851 is a medium-severity vulnerability. It was published on November 28, 2018 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2018-16851?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2018-16851?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-16851?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-16851 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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