What is CVE-2022-42898?

CVE-2022-42898 is a high-severity vulnerability in Heimdal Project, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2022-12-25.

How severe is CVE-2022-42898?

High severity. CVSS v3 base score is 8.8 out of 10.

Is CVE-2022-42898 known to be exploited?

8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Heimdal Project

CVE-2022-42898

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 has "a similar bug."

Vulnerability class: Integer Overflow

Published 2022-12-25 · last modified 2026-10-14.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.065 (93.7th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 93.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.064 · newest: 0.065 · change: +0.001

Affected products

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

References

web.mit.edu/kerberos/advisories/ (Vendor Advisory)
www.samba.org/samba/security/CVE-2022-42898.html (Third Party Advisory)
github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583 (Patch, Third Party Advisory)
github.com/heimdal/heimdal/security/advisories/GHSA-64mq-fvfj-5x3c (Third Party Advisory)
web.mit.edu/kerberos/krb5-1.20/README-1.20.1.txt (Vendor Advisory)
web.mit.edu/kerberos/krb5-1.19/ (Release Notes, Vendor Advisory)
bugzilla.samba.org/show_bug.cgi (Exploit, Patch, Third Party Advisory, Issue Tracking)
security.netapp.com/advisory/ntap-20230216-0008/
security.netapp.com/advisory/ntap-20230223-0001/
security.gentoo.org/glsa/202309-06 (vendor-advisory)

Frequently asked questions

What is CVE-2022-42898?: CVE-2022-42898 is a high-severity vulnerability in Heimdal Project, classified under Integer Overflow or Wraparound. CVSS score: 8.8/10. Published 2022-12-25.
How severe is CVE-2022-42898?: High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2022-42898 known to be exploited?: 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.