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TI-2023-20868 Aliases CVE-2023-39975GHSA-4grv-wgvh-8x82

kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that…

Priority MEDIUM 43CWE-415Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-415 and the CVSS impact.

Summary

kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01468 73rd percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

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

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:*1.21 to before 1.21.2Vulnerablemoos-ivp
  • cpe:2.3:a:mit:kerberos_5:*:*:*:*:*:*:*:* Versions 1.21 to before 1.21.2 Vulnerable ·moos-ivp

Remediation

Red Hat 1 advisory

  • RHSA-2023:6699 Released 2023-11-07 · Red Hat rating Moderate
    krb5 security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 9) krb5-devel-1.21.1-1.el9
    • Red Hat Enterprise Linux BaseOS (v. 9) krb5-1.21.1-1.el9, krb5-libs-1.21.1-1.el9, krb5-pkinit-1.21.1-1.el9 +4

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2023:6699
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2023:6699
Not affected: 3 products
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-39975
  2. 2026-10-03 Alias added: GHSA-4grv-wgvh-8x82

References

Patch 2

Advisory 1

Other 3

  • TI-2024-17421 Kerberos 5 (aka krb5) 1.21.2 contains a memory leak vulnerability in /krb5/src/lib/gssapi/krb5/k5sealv3.c. CVSS 3.1HIGH 7.5
  • TI-2001-00539 Buffer overflow in BSD-based telnetd telnet daemon on various operating systems allows… CVSS 2.0HIGH 10.0
  • TI-2026-29130 NULL pointer dereference in moos-ivp Kerberos 5 CVSS 3.1HIGH 7.5
  • TI-2007-00929 The telnet daemon (telnetd) in MIT krb5 before 1.6.1 allows remote attackers to bypass… CVSS 2.0HIGH 10.0
  • TI-2011-00268 The process_chpw_request function in schpw.c in the password-changing functionality in… CVSS 2.0HIGH 10.0
  • TI-2001-00245 Buffer overflows in BSD-based FTP servers allows remote attackers to execute arbitrary… CVSS 2.0HIGH 10.0
See all 138 →

Sources

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