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TI-2021-15622 Aliases CVE-2021-37750GHSA-p36j-vmfc-m4v5

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

Priority LOW 34CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-476.

Summary

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.

Why it matters now

EPSS 0.02505 84th percentileScored 2026-11-07
Fix Fixed Red Hat: 2 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*before 1.18.5; 1.19.0 to before 1.19.3Vulnerablemoos-ivp
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8r13:14338:*:*:*:*:*:*v8r13 14338VulnerableStarwindsoftware
cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:22.1.0:*:*:*:*:*:*:*22.1.0VulnerableOracle
  • cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* Versions before 1.18.5; 1.19.0 to before 1.19.3 Vulnerable ·moos-ivp
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:a:starwindsoftware:starwind_virtual_san:v8r13:14338:*:*:*:*:*:* Versions v8r13 14338 Vulnerable ·Starwindsoftware
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_slice_selection_function:22.1.0:*:*:*:*:*:*:* Versions 22.1.0 Vulnerable ·Oracle

Remediation

Red Hat 2 advisories

  • RHSA-2021:4788 Released 2021-11-23 · Red Hat rating Moderate
    krb5 security update
    • Red Hat Enterprise Linux Client (v. 7) krb5-1.15.1-51.el7_9, krb5-libs-1.15.1-51.el7_9, krb5-pkinit-1.15.1-51.el7_9 +2
    • Red Hat Enterprise Linux Client Optional (v. 7) krb5-devel-1.15.1-51.el7_9, krb5-server-1.15.1-51.el7_9, krb5-server-ldap-1.15.1-51.el7_9
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) krb5-devel-1.15.1-51.el7_9, krb5-server-1.15.1-51.el7_9, krb5-server-ldap-1.15.1-51.el7_9
    • Red Hat Enterprise Linux Server (v. 7) krb5-1.15.1-51.el7_9, krb5-devel-1.15.1-51.el7_9, krb5-devel-1.15.1-51.el7_9.ppc +8
    • Red Hat Enterprise Linux Workstation (v. 7) krb5-1.15.1-51.el7_9, krb5-devel-1.15.1-51.el7_9, krb5-libs-1.15.1-51.el7_9 +5
  • RHSA-2021:3576 Released 2021-09-21 · Red Hat rating Moderate
    krb5 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) krb5-1.18.2-8.3.el8_4, krb5-devel-1.18.2-8.3.el8_4, krb5-libs-1.18.2-8.3.el8_4 +5

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:3576
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2021:4788
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2021:4788
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2021:4788
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2021:4788
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2021:4788
Not affected: 4 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 9
  • Red Hat JBoss Core Services
  • Red Hat JBoss Enterprise Application Platform 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-37750
  2. 2026-10-03 Alias added: GHSA-p36j-vmfc-m4v5

References

Patch 2

Advisory 6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences