HOMEVULNERABILITIESCVE-2023-39975
HIGH

CVE-2023-39975

CWE-415Published: August 16, 2023· Updated: Jun 17, 2026

8.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2023-39975 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 8.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
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

Affected Vendors & Products

mit1 product(s)
kerberos 5
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
PATCHhttps://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
PATCHhttps://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
PATCHhttps://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
ADVISORYhttps://web.mit.edu/kerberos/www/advisories/
ADVISORYhttps://web.mit.edu/kerberos/www/advisories/

All References (12)

→
https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840Patch
→
https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-finalPatch
→
https://security.netapp.com/advisory/ntap-20230915-0014/
→
https://security.netapp.com/advisory/ntap-20240201-0005/
→
https://security.netapp.com/advisory/ntap-20240201-0008/
→
https://web.mit.edu/kerberos/www/advisories/Vendor Advisory
→
https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840Patch
→
https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-finalPatch
→
https://security.netapp.com/advisory/ntap-20230915-0014/
→
https://security.netapp.com/advisory/ntap-20240201-0005/
→
https://security.netapp.com/advisory/ntap-20240201-0008/
→
https://web.mit.edu/kerberos/www/advisories/Vendor Advisory

Quick Facts

CVE IDCVE-2023-39975
CVSS Score8.8 / 10
SeverityHIGH
WeaknessCWE-415
CISA KEVNo
Affected1 vendor(s)
PublishedAug 16, 2023

Related CVEs (CWE-415)

CVE-2018-0101
10.0
CVE-2017-5334
9.8
CVE-2024-45402
9.8
CVE-2016-3177
9.8
CVE-2016-6912
9.8
CVE-2017-1000072
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-39975 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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