CVE-2023-39975

Name: CVE-2023-39975
Creator: NVD / NIST
Published: 2023-08-16T15:15:11.277+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.23%

Last modified Jun 17, 2026

CVE-2023-39975 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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.. EPSS estimates a 1.23% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.23%

65.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mit	Kerberos 5	>= 1.21, < 1.21.2

References

Timeline

Published: Aug 16, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-39975?

How severe is CVE-2023-39975?

CVE-2023-39975 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.23% probability of exploitation in the next 30 days.

How do I fix CVE-2023-39975?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-39975?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST