Is CVE-2016-3120 in the CISA KEV catalog?

No. CVE-2016-3120 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-3120?

CVE-2016-3120 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2016-3120?

CVE-2016-3120 has an EPSS score of 4.62% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-3120?

Upgrade krb5 on debian 11 to 1.14.3+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-3120

MEDIUMEPSS 91th pctl

6.5

CVSS v3

NVD

Description

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

krb5Debian

Fixed in:1.14.3+dfsg-1CVE-2016-3120

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

Exploit Intelligence

4.62%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Issue Tracking1

krbdev.mit.edu

Other references9

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 2026-05-06.