CVE-2021-36222

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Summary

CVECVE-2021-36222
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-07-22 18:15:23 UTC
Updated2026-10-14 12:17:14 UTC
Descriptionec_verify in kdc/kdc_preauth_ec.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.4 and 1.19.x before 1.19.2 allows remote attackers to cause a NULL pointer dereference and daemon crash. This occurs because a return value is not properly managed in a certain situation.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-476 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS v3.1 Breakdown

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

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

CVSS v2.0 Breakdown

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

AV:N/AC:L/Au:N/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
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
Debian -- Security Information -- DSA-4944-1 krb5 af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
Oracle Critical Patch Update Advisory - October 2021 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Patch, Third Party Advisory
October 2021 MySQL Server Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Fix KDC null deref on bad encrypted challenge · krb5/krb5@fc98f52 · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Patch, 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 Not Applicable
CVE-2021-36222 MIT Kerberos 5 Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
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)
  • 178721 Debian Security Update for krb5 (DSA 4944-1)
  • 180209 Debian Security Update for krb5 (CVE-2021-36222)
  • 199244 Ubuntu Security Notification for Kerberos Vulnerabilities (USN-5959-1)
  • 20236 Oracle MySQL October 2021 Critical Patch Update (CPU October 2021)
  • 239649 Red Hat Update for krb5 (RHSA-2021:3576)
  • 281715 Fedora Security Update for krb5 (FEDORA-2021-8b25e4642f)
  • 281728 Fedora Security Update for krb5 (FEDORA-2021-2bae525fd3)
  • 377412 Alibaba Cloud Linux Security Update for krb5 (ALINUX3-SA-2021:0068)
  • 500276 Alpine Linux Security Update for krb5
  • 504041 Alpine Linux Security Update for krb5
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 670708 EulerOS Security Update for krb5 (EulerOS-SA-2021-2466)
  • 670820 EulerOS Security Update for krb5 (EulerOS-SA-2021-2714)
  • 670960 EulerOS Security Update for krb5 (EulerOS-SA-2021-2689)
  • 690192 Free Berkeley Software Distribution (FreeBSD) Security Update for mysql (c9387e4d-2f5f-11ec-8be6-d4c9ef517024)
  • 750992 SUSE Enterprise Linux Security Update for krb5 (SUSE-SU-2021:2800-1)
  • 751001 OpenSUSE Security Update for krb5 (openSUSE-SU-2021:1182-1)
  • 751021 OpenSUSE Security Update for krb5 (openSUSE-SU-2021:2800-1)
  • 751680 OpenSUSE Security Update for samba (openSUSE-SU-2022:0283-1)
  • 751994 SUSE Enterprise Linux Security Update for samba (SUSE-SU-2022:0283-1)
  • 752251 SUSE Enterprise Linux Security Update for SUSE Manager Client Tools (SUSE-SU-2022:2134-1)
  • 752995 SUSE Enterprise Linux Security Update for grafana (SUSE-SU-2022:4428-1)
  • 900399 Common Base Linux Mariner (CBL-Mariner) Security Update for krb5 (5994)
  • 901253 Common Base Linux Mariner (CBL-Mariner) Security Update for krb5 (6607-1)
  • 940422 AlmaLinux Security Update for krb5 (ALSA-2021:3576)

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