CVE-2023-39975

HIGHNVD 8.88.8—

8.8

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.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 79.4%
KEV: Not listed

Published

August 16, 2023

Last Modified

February 25, 2026

References (12)

cve@mitrehttps://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
cve@mitrehttps://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
cve@mitrehttps://security.netapp.com/advisory/ntap-20230915-0014/
cve@mitrehttps://security.netapp.com/advisory/ntap-20240201-0005/
cve@mitrehttps://security.netapp.com/advisory/ntap-20240201-0008/
cve@mitrehttps://web.mit.edu/kerberos/www/advisories/
af854a3a-2127-422b-91ae-364da2661108https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
af854a3a-2127-422b-91ae-364da2661108https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20230915-0014/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240201-0005/
af854a3a-2127-422b-91ae-364da2661108https://security.netapp.com/advisory/ntap-20240201-0008/
af854a3a-2127-422b-91ae-364da2661108https://web.mit.edu/kerberos/www/advisories/

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	krb5-0:1.21.1-1.el9	2023-11-07	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-415Double Free

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Red HatRHSA-2023:6699IMPORTANT2023-08-16
RHSA-2023:6699 — Important

Data Freshness Timeline

(refreshed 12× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 19:14 UTCEG score recompute

Frequently asked(5)

What is CVE-2023-39975?

CVE-2023-39975 is a high vulnerability published on August 16, 2023. kdc/dotgsreq.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.

When was CVE-2023-39975 disclosed?

CVE-2023-39975 was first published in the National Vulnerability Database on August 16, 2023, with the most recent update on February 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-39975 actively exploited?

CVE-2023-39975 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 79.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-39975?

CVE-2023-39975 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2023-39975?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39975, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2023-39975

Published

Last Modified

References (12)

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-39975?

Same vendor

Same CWE

CVE-2023-39975

📅 Published

🔄 Last Modified

🔗 References (12)

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-39975?

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References (12)

Frequently asked(5)

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