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CVE-2016-3120

26
FAUCET Score

CVE-2016-3120 is a denial-of-service vulnerability affecting MIT Kerberos 5 (versions prior to 1.13.6 and 1.14.3) when the restrict_anonymous_to_tgt option is enabled. It allows remote authenticated users to crash the KDC daemon via a crafted S4U2Self request, leading to a NULL pointer dereference. This vulnerability has a CVSS v3 score of 6.5 (Medium), indicating a network-based attack with low complexity, requiring low privileges, and resulting in high availability impact. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.13CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:1.13:*:*:*:*:*:*:*
1.13.1CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:1.13.1:*:*:*:*:*:*:*
1.13.2CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:1.13.2:*:*:*:*:*:*:*
1.13.3CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:1.13.3:*:*:*:*:*:*:*
1.13.4CPE matchmatch criteria
cpe:2.3:a:mit:kerberos_5:1.13.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.62%
Probability of exploitation in next 30 days
EPSS Percentile
90.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0462 is in the 97th percentile among its peer group of 21,977 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: krb5-0:1.14.1-26.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: krb5

Vendor Advisories (1)

redhatCVE-2016-3120Low

krb5: S4U2Self KDC crash when anon is restricted

Jul 19, 2016

References

krbdev.mit.edu / rt/Ticket/Display.html
Issue Tracking
lists.opensuse.org / opensuse-updates/2016-09/msg00035.html
rhn.redhat.com / errata/RHSA-2016-2591.html
github.com / krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
lists.debian.org / debian-lts-announce/2018/01/msg00040.html
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/AWL3KYFRJIX37EAM4DKCQQIQP2WBKL35
web.mit.edu / kerberos/krb5-1.13
web.mit.edu / kerberos/krb5-1.14
securityfocus.com / bid/92132
securitytracker.com / id/1036442