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CVE-2021-37750

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1...

6.5 MediumFix available

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

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

2.50%Up 1.7 points since Aug 23, 2021
90%50%10%1%

What each source reports

NVD Score used 6.5

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
CVE-2021-37750
CVSS 3.1
6.5 MediumCVSS:3.1/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 Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
CVE-2021-37750
Updated
2026-11-02
EUVDEUVD-2021-24231 No score

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
EUVD-2021-24231
Updated
2026-11-02
GitHub AdvisoriesGHSA-p36j-vmfc-m4v5 6.5

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1...

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
GHSA-p36j-vmfc-m4v5
CVSS 3.1
6.5 MediumCVSS:3.1/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-2021-37750 6.5

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
ALPINE-CVE-2021-37750
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVAZL-6608 6.5

CVE-2021-37750 affecting package krb5 for versions less than 1.19.3-1

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
AZL-6608
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 16 moreShow less
OSVBELL-CVE-2021-37750 6.5

CVE-2021-37750 does not affect BellSoft software

Record
BELL-CVE-2021-37750
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 6.5

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
CVE-2021-37750
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2021-37750 6.5

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
DEBIAN-CVE-2021-37750
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2021-1329 4.3

krb5 security update

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography.

Security Fix(es):

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.(CVE-2021-37750)

Record
OESA-2021-1329
CVSS 3.1
4.3 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
OSVRHSA-2021:3576 7.5

Red Hat Security Advisory: krb5 security update

Record
RHSA-2021:3576
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2021:4788 6.5

Red Hat Security Advisory: krb5 security update

Record
RHSA-2021:4788
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRLSA-2021:3576 7.5

Moderate: krb5 security update

Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).

Security Fix(es):

  • krb5: Sending a request containing PA-ENCRYPTED-CHALLENGE padata element without using FAST could result in NULL dereference in KDC which leads to DoS (CVE-2021-36222)

  • krb5: NULL pointer dereference in process_tgs_req() in kdc/do_tgs_req.c via a FAST inner body that lacks server field (CVE-2021-37750)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2021:3576
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-37750 6.5

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Record
UBUNTU-CVE-2021-37750
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2021:1411-1 No score

Security update for krb5

This update for krb5 fixes the following issues:

  • CVE-2021-37750: Fixed KDC null pointer dereference via a FAST inner body that lacks a server field (bsc#1189929).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Record
openSUSE-SU-2021:1411-1
Updated
2026-11-02
OSVopenSUSE-SU-2021:3454-1 No score

Security update for krb5

This update for krb5 fixes the following issues:

  • CVE-2021-37750: Fixed KDC null pointer dereference via a FAST inner body that lacks a server field (bsc#1189929).
Record
openSUSE-SU-2021:3454-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:10899-1 No score

krb5-1.19.2-2.2 on GA media

These are all security issues fixed in the krb5-1.19.2-2.2 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10899-1
Updated
2026-11-02
OSVSUSE-SU-2021:3454-1 No score

Security update for krb5

This update for krb5 fixes the following issues:

  • CVE-2021-37750: Fixed KDC null pointer dereference via a FAST inner body that lacks a server field (bsc#1189929).
Record
SUSE-SU-2021:3454-1
Updated
2026-11-02
OSVSUSE-SU-2021:3454-2 No score

Security update for krb5

This update for krb5 fixes the following issues:

  • CVE-2021-37750: Fixed KDC null pointer dereference via a FAST inner body that lacks a server field (bsc#1189929).
Record
SUSE-SU-2021:3454-2
Updated
2026-11-02
OSVSUSE-SU-2022:4154-1 No score

Security update for krb5

This update for krb5 fixes the following issues:

  • CVE-2021-37750: Fixed KDC null pointer dereference via a FAST inner body that lacks a server field (bsc#1189929).
  • CVE-2022-42898: Fixed integer overflow in PAC parsing (bsc#1205126).
Record
SUSE-SU-2022:4154-1
Updated
2026-11-02
OSVSUSE-SU-2024:1702-1 No score

Security update for krb5

This update for krb5 fixes the following issues:

Fixed inside previous release (v1.16.3-46.3.1):

  • CVE-2021-37750: Fixed KDC null pointer dereference via a FAST inner body that lacked a server field (bsc#1189929).
Record
SUSE-SU-2024:1702-1
Updated
2026-11-02
OSVUSN-5959-1 No score

krb5 vulnerabilities

It was discovered that Kerberos incorrectly handled memory when processing KDC data, which could lead to a NULL pointer dereference. An attacker could possibly use this issue to cause a denial of service or have other unspecified impacts. (CVE-2021-36222, CVE-2021-37750)

Record
USN-5959-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
krb5
Alpine:v3.12
 before 1.18.5-r0
1.18.5-r0
krb5
Alpine:v3.13
 before 1.18.5-r0
1.18.5-r0
krb5
Alpine:v3.14
 before 1.18.5-r0
1.18.5-r0
krb5
Alpine:v3.15
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.16
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.17
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.18
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.19
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.20
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.21
 before 1.19.3-r0
1.19.3-r0
Show 80 moreShow less
Affected packages
PackageAffectedFixed
krb5
Alpine:v3.22
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.23
 before 1.19.3-r0
1.19.3-r0
krb5
Alpine:v3.24
 before 1.19.3-r0
1.19.3-r0
krb5
Azure Linux:2
 before 1.19.3-1
1.19.3-1
krb5
Debian:12
 before 1.18.3-7
1.18.3-7
krb5
Debian:13
 before 1.18.3-7
1.18.3-7
krb5
Debian:14
 before 1.18.3-7
1.18.3-7
krb5
Debian:9
From an advisory covering 5 CVEs
 before 1.15-1+deb9u3, plus listed versions
1.15-11.15-1+deb9u11.15-1+deb9u2
1.15-1+deb9u3
krb5
openEuler:20.03-LTS-SP1
 before 1.18.2-5.oe1
1.18.2-5.oe1
krb5
openEuler:20.03-LTS-SP2
 before 1.18.2-5.oe1
1.18.2-5.oe1
krb5
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-debugsource
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-devel
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-devel-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-libs
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-libs-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-pkinit
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-pkinit-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-server
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-server-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-server-ldap
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-server-ldap-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-workstation
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5-workstation-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
libkadm5
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
libkadm5-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-debuginfo
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-libs
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-pkinit
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-workstation
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
libkadm5
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-devel
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server-ldap
Red Hat:enterprise_linux:7::client
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-debuginfo
Red Hat:enterprise_linux:7::computenode
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-devel
Red Hat:enterprise_linux:7::computenode
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server
Red Hat:enterprise_linux:7::computenode
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server-ldap
Red Hat:enterprise_linux:7::computenode
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-debuginfo
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-devel
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-libs
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-pkinit
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server-ldap
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-workstation
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
libkadm5
Red Hat:enterprise_linux:7::server
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-debuginfo
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-devel
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-libs
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-pkinit
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-server-ldap
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5-workstation
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
libkadm5
Red Hat:enterprise_linux:7::workstation
 before 0:1.15.1-51.el7_9
0:1.15.1-51.el7_9
krb5
Rocky Linux:8
From an advisory covering 2 CVEs
 before 0:1.18.2-8.3.el8_4
0:1.18.2-8.3.el8_4
krb5
SUSE:Linux Enterprise Module for Basesystem 15 SP2
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
SUSE:Linux Enterprise Module for Basesystem 15 SP3
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
SUSE:Linux Enterprise Module for Server Applications 15 SP2
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
SUSE:Linux Enterprise Module for Server Applications 15 SP3
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
SUSE:Linux Enterprise Micro 5.0
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
SUSE:Linux Enterprise Micro 5.1
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
SUSE:Linux Enterprise High Performance Computing 15-ESPOS
From an advisory covering 2 CVEs
 before 1.15.2-150000.6.17.1
1.15.2-150000.6.17.1
krb5
SUSE:Linux Enterprise High Performance Computing 15-LTSS
From an advisory covering 2 CVEs
 before 1.15.2-150000.6.17.1
1.15.2-150000.6.17.1
krb5
SUSE:Linux Enterprise Server 15-LTSS
From an advisory covering 2 CVEs
 before 1.15.2-150000.6.17.1
1.15.2-150000.6.17.1
krb5
SUSE:Linux Enterprise Server for SAP Applications 15
From an advisory covering 2 CVEs
 before 1.15.2-150000.6.17.1
1.15.2-150000.6.17.1
krb5
SUSE:Linux Enterprise Software Development Kit 12 SP5
 before 1.16.3-46.12.1
1.16.3-46.12.1
krb5
SUSE:Linux Enterprise Server 12 SP5
 before 1.16.3-46.12.1
1.16.3-46.12.1
krb5
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
 before 1.16.3-46.12.1
1.16.3-46.12.1
krb5
Ubuntu:18.04:LTS
 before 1.16-2ubuntu0.4, plus listed versions
1.15.1-21.16-21.16-2build11.16-2ubuntu0.11.16-2ubuntu0.21.16-2ubuntu0.3
1.16-2ubuntu0.4
krb5
Ubuntu:20.04:LTS
 before 1.17-6ubuntu4.3, plus listed versions
1.17-61.17-6ubuntu31.17-6ubuntu41.17-6ubuntu4.11.17-6ubuntu4.2
1.17-6ubuntu4.3
krb5
Ubuntu:18.04:LTS
From an advisory covering 2 CVEs
 before 1.16-2ubuntu0.4, plus listed versions
1.15.1-21.16-21.16-2build11.16-2ubuntu0.11.16-2ubuntu0.21.16-2ubuntu0.3
1.16-2ubuntu0.4
krb5
Ubuntu:20.04:LTS
From an advisory covering 2 CVEs
 before 1.17-6ubuntu4.3, plus listed versions
1.17-61.17-6ubuntu31.17-6ubuntu41.17-6ubuntu4.11.17-6ubuntu4.2
1.17-6ubuntu4.3
krb5
openSUSE:Leap 15.2
 before 1.16.3-lp152.5.22.1
1.16.3-lp152.5.22.1
krb5-mini
openSUSE:Leap 15.2
 before 1.16.3-lp152.5.22.1
1.16.3-lp152.5.22.1
krb5
openSUSE:Leap 15.3
 before 1.16.3-3.24.1
1.16.3-3.24.1
krb5
openSUSE:Tumbleweed
From an advisory covering 20 CVEs
 before 1.19.2-2.2
1.19.2-2.2

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-37750 is a medium vulnerability (CVSS 6.5) in Mit Kerberos 5, published August 23, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.50%, the 84th percentile. Fixed in krb5 1.18.5-r0.

References

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