CVE-2022-42898 — PAC parsing in MIT Kerberos 5 (aka krb5) before 1

PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cau

01What is this vulnerability?

PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1…

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-12-25T06:15:09.427
• Last modified: 2026-10-14T19:16:52.490

09References

• bugzilla.samba.org — https://bugzilla.samba.org/show_bug.cgi?id=15203
• github.com — https://github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c
• github.com — https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583
• security.gentoo.org — https://security.gentoo.org/glsa/202309-06
• security.gentoo.org — https://security.gentoo.org/glsa/202310-06
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230216-0008/
• security.netapp.com — https://security.netapp.com/advisory/ntap-20230223-0001/
• web.mit.edu — https://web.mit.edu/kerberos/advisories/
• web.mit.edu — https://web.mit.edu/kerberos/krb5-1.19/
• web.mit.edu — https://web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt