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CVE-2016-3120

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT...

6.5 MediumFix available

CVE-2016-3120 is a medium vulnerability (CVSS 6.5) in Mit Kerberos 5, published August 1, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.62%, the 91st percentile. Fixed in krb5 1.13.6-r0.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

4.62%Up 2.8 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 6.5

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.

Record
CVE-2016-3120
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2016-3120
Updated
2026-11-02
EUVDEUVD-2016-4173 No score

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.

Record
EUVD-2016-4173
Updated
2026-11-03
GitHub AdvisoriesGHSA-8q8p-vxj6-fg2g 6.5

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT...

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.

Record
GHSA-8q8p-vxj6-fg2g
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSVALPINE-CVE-2016-3120 6.5

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.

Record
ALPINE-CVE-2016-3120
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVBELL-CVE-2016-3120 6.5

CVE-2016-3120 does not affect BellSoft software

Record
BELL-CVE-2016-3120
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 7 moreShow less
OSV 6.5

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.

Record
CVE-2016-3120
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2016-3120 6.5

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.

Record
DEBIAN-CVE-2016-3120
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2016:2591 5.3

Red Hat Security Advisory: krb5 security, bug fix, and enhancement update

Record
RHSA-2016:2591
CVSS 3.0
5.3 MediumCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2016-3120 6.5

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.

Record
UBUNTU-CVE-2016-3120
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVMGASA-2016-0306 No score

Updated krb5 packages fix security vulnerability

The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 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 (CVE-2016-3120).

Record
MGASA-2016-0306
Updated
2026-11-02
OSVopenSUSE-SU-2024:10004-1 No score

krb5-1.15-1.1 on GA media

These are all security issues fixed in the krb5-1.15-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10004-1
Updated
2026-11-02
OSVSUSE-SU-2016:2136-1 No score

Security update for krb5

This update for krb5 fixes the following issues:

  • CVE-2016-3120: KDC NULL Pointer Dereference Denial Of Service Vulnerability (bsc#991088)
Record
SUSE-SU-2016:2136-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
krb5
Alpine:v3.2
 before 1.13.6-r0
1.13.6-r0
krb5
Alpine:v3.3
 before 1.14.3-r0
1.14.3-r0
krb5
Alpine:v3.4
 before 1.14.3-r0
1.14.3-r0
krb5
Debian:12
 before 1.14.3+dfsg-1
1.14.3+dfsg-1
krb5
Debian:13
 before 1.14.3+dfsg-1
1.14.3+dfsg-1
krb5
Debian:14
 before 1.14.3+dfsg-1
1.14.3+dfsg-1
krb5
Debian:7
 before 1.10.1+dfsg-5+deb7u9, plus listed versions
1.10.1+dfsg-51.10.1+dfsg-5+deb7u11.10.1+dfsg-5+deb7u21.10.1+dfsg-5+deb7u31.10.1+dfsg-5+deb7u4
Show 4 moreShow less
1.10.1+dfsg-5+deb7u51.10.1+dfsg-5+deb7u61.10.1+dfsg-5+deb7u71.10.1+dfsg-5+deb7u8
1.10.1+dfsg-5+deb7u9
krb5
Mageia:5
 before 1.12.5-1.1.mga5
1.12.5-1.1.mga5
krb5-debuginfo
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-devel
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
Show 41 moreShow less
Affected packages
PackageAffectedFixed
krb5-server
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server-ldap
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-libs
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-pkinit
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-workstation
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
libkadm5
Red Hat:enterprise_linux:7::client
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-debuginfo
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-devel
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server-ldap
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-libs
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-pkinit
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-workstation
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
libkadm5
Red Hat:enterprise_linux:7::computenode
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-debuginfo
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-devel
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-libs
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-pkinit
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server-ldap
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-workstation
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
libkadm5
Red Hat:enterprise_linux:7::server
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-debuginfo
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-devel
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-libs
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-pkinit
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-server-ldap
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5-workstation
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
libkadm5
Red Hat:enterprise_linux:7::workstation
 before 0:1.14.1-26.el7
0:1.14.1-26.el7
krb5
SUSE:Linux Enterprise Desktop 12 SP1
 before 1.12.1-36.4
1.12.1-36.4
krb5
SUSE:Linux Enterprise Software Development Kit 12 SP1
 before 1.12.1-36.4
1.12.1-36.4
krb5
SUSE:Linux Enterprise Server 12 SP1
 before 1.12.1-36.4
1.12.1-36.4
krb5
SUSE:Linux Enterprise Server for SAP Applications 12 SP1
 before 1.12.1-36.4
1.12.1-36.4
krb5
Ubuntu:14.04:LTS
 before 1.12+dfsg-2ubuntu5.4, plus listed versions
1.10.1+dfsg-6.1ubuntu11.11.3+dfsg-3ubuntu21.12+dfsg-2ubuntu11.12+dfsg-2ubuntu21.12+dfsg-2ubuntu3
Show 6 moreShow less
1.12+dfsg-2ubuntu41.12+dfsg-2ubuntu4.21.12+dfsg-2ubuntu51.12+dfsg-2ubuntu5.11.12+dfsg-2ubuntu5.21.12+dfsg-2ubuntu5.3
1.12+dfsg-2ubuntu5.4
krb5
Ubuntu:16.04:LTS
 before 1.13.2+dfsg-5ubuntu2.1, plus listed versions
1.13.2+dfsg-21.13.2+dfsg-31.13.2+dfsg-41.13.2+dfsg-51.13.2+dfsg-5ubuntu11.13.2+dfsg-5ubuntu2
1.13.2+dfsg-5ubuntu2.1
krb5
openSUSE:Tumbleweed
 before 1.15-1.1
1.15-1.1

History

History
WhenChangedSources
2026-11-03aliasesEUVD
2026-11-02createdCVE List, GitHub Advisories, NVD, OSV

References

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