CVE-2021-37750

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Summary

CVECVE-2021-37750
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-08-23 05:15:08 UTC
Updated2026-10-14 12:17:15 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

Problem Types: CWE-476 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary4AV:N/AC:L/Au:S/C:N/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
Single
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:L/Au:S/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Mit Kerberos 5 All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
Fix KDC null deref on TGS inner body null server · krb5/krb5@d775c95 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
[SECURITY] Fedora 33 Update: krb5-1.18.2-31.fc33 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Oracle Critical Patch Update Advisory - July 2022 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
[SECURITY] [DLA 2771-1] krb5 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
Releases · krb5/krb5 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Release Notes, Third Party Advisory
Kerberos Security Advisories af854a3a-2127-422b-91ae-364da2661108 web.mit.edu Vendor Advisory
CVE-2021-37750 MIT Kerberos 5 Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
CVE-2021-37750 MIT Kerberos 5 vulnerability in StarWind products af854a3a-2127-422b-91ae-364da2661108 www.starwindsoftware.com Third Party Advisory
[SECURITY] Fedora 33 Update: krb5-1.18.2-31.fc33 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159406 Oracle Enterprise Linux Security Update for krb5 (ELSA-2021-3576)
  • 159541 Oracle Enterprise Linux Security Update for krb5 (ELSA-2021-4788)
  • 178852 Debian Security Update for krb5 (DLA 2771-1)
  • 180600 Debian Security Update for krb5 (CVE-2021-37750)
  • 199244 Ubuntu Security Notification for Kerberos Vulnerabilities (USN-5959-1)
  • 20317 Oracle Database 21c Critical Patch Update - January 2023
  • 20318 Oracle Database 19c Critical Patch Update - January 2023
  • 20319 Oracle Database 19c Critical OJVM Patch Update - January 2023
  • 239649 Red Hat Update for krb5 (RHSA-2021:3576)
  • 239903 Red Hat Update for krb5 (RHSA-2021:4788)
  • 257133 CentOS Security Update for krb5 (CESA-2021:4788)
  • 281836 Fedora Security Update for krb5 (FEDORA-2021-20b495cb94)
  • 281865 Fedora Security Update for krb5 (FEDORA-2021-f2c8514f02)
  • 296086 Oracle Solaris 11.4 Support Repository Update (SRU) 51.132.1 Missing (CPUOCT2022)
  • 353125 Amazon Linux Security Advisory for krb5 : ALAS2-2022-1738
  • 377262 Alibaba Cloud Linux Security Update for krb5 (ALINUX2-SA-2021:0068)
  • 377412 Alibaba Cloud Linux Security Update for krb5 (ALINUX3-SA-2021:0068)
  • 500277 Alpine Linux Security Update for krb5
  • 501964 Alpine Linux Security Update for krb5
  • 504042 Alpine Linux Security Update for krb5
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670820 EulerOS Security Update for krb5 (EulerOS-SA-2021-2714)
  • 670960 EulerOS Security Update for krb5 (EulerOS-SA-2021-2689)
  • 671029 EulerOS Security Update for krb5 (EulerOS-SA-2021-2664)
  • 671054 EulerOS Security Update for krb5 (EulerOS-SA-2021-2637)
  • 671234 EulerOS Security Update for krb5 (EulerOS-SA-2022-1172)
  • 730371 McAfee Web Gateway Multiple Vulnerabilities (WP-3335,WP-4131,WP-4159,WP-4237,WP-4259,WP-4329,WP-4348,WP-4355,WP-4376,WP-4407,WP-4421)
  • 751249 OpenSUSE Security Update for krb5 (openSUSE-SU-2021:3454-1)
  • 751297 OpenSUSE Security Update for krb5 (openSUSE-SU-2021:1411-1)
  • 752841 SUSE Enterprise Linux Security Update for krb5 (SUSE-SU-2022:4154-1)
  • 900435 Common Base Linux Mariner (CBL-Mariner) Security Update for krb5 (5995)
  • 901521 Common Base Linux Mariner (CBL-Mariner) Security Update for krb5 (6608)
  • 902338 Common Base Linux Mariner (CBL-Mariner) Security Update for krb5 (6608-1)
  • 940422 AlmaLinux Security Update for krb5 (ALSA-2021:3576)
  • 960057 Rocky Linux Security Update for krb5 (RLSA-2021:3576)

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