Is CVE-2018-16851 in the CISA KEV catalog?

No. CVE-2018-16851 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-16851?

CVE-2018-16851 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2018-16851?

CVE-2018-16851 has an EPSS score of 3.25% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-16851?

Upgrade samba on debian 11 to 2:4.9.2+dfsg-2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2018-16851

MEDIUMEPSS 87th pctl

6.5

CVSS v3

NVD

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.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

sambaDebian

Fixed in:2:4.9.2+dfsg-2CVE-2018-16851

sambaUbuntu

Fixed in:2:4.3.11+dfsg-0ubuntu0.14.04.19USN-3827-1

Fixed in:2:4.3.11+dfsg-0ubuntu0.16.04.18USN-3827-1

Fixed in:2:4.7.6+dfsg~ubuntu-0ubuntu2.5USN-3827-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

3.25%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Patch1

samba.org

Third-Party Advisory8

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.