Is CVE-2023-39975 in the CISA KEV catalog?

No. CVE-2023-39975 is not currently on the CISA Known Exploited Vulnerabilities list.

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

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

What is the EPSS score for CVE-2023-39975?

CVE-2023-39975 has an EPSS score of 1.23% (65th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-39975?

Upgrade krb5 on rhel 9 to 0:1.21.1-1.el9 or later. Fixes are available for 32 affected products.

CVE & CISA-KEV Catalog

CVE-2023-39975

HIGH

8.8

CVSS v3

NVD

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.

CWE-415

How to fix

Remediation Available

krb5Red Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5Rocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-debugsourceRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-debugsourceRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-develRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-develRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-libsRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-libsRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-libs-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-libs-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-pkinitRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-pkinitRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-pkinit-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-pkinit-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-serverRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-serverRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-server-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-server-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-server-ldapRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-server-ldapRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-server-ldap-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-server-ldap-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-workstationRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-workstationRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-workstation-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

krb5-workstation-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

libkadm5Red Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

libkadm5Rocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

libkadm5-debuginfoRed Hat / RHEL

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

libkadm5-debuginfoRocky

Fixed in:0:1.21.1-1.el9RHSA-2023:6699

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.23%probability of exploitation in 30 days

65thpercentile

Moderate risk: more likely to be exploited than 65% of all known CVEs.

References

Patch2

Vendor Advisory1

web.mit.edu

Other references3

Related Vulnerabilities

Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-25136	Medium	6.5	90%	-	Fix
CVE-2018-0101	Critical	10.0	87%	-	Fix
CVE-2003-0545	Critical	9.8	85%	-	Fix
CVE-2019-3829	Medium	5.3	59%	-	Fix
CVE-2026-33824	Critical	9.8	56%	-	Fix
CVE-2021-3407	Medium	5.5	50%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-25.