In MIT Kerberos 5 (aka krb5) 1.7 and later, an authenticated attacker can cause a KDC assertion failure by sending invalid S4U2Self or S4U2Proxy requests.
Severity
CVSS 3.0
6.5 medium
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
2.4% chance of exploitation in the next 30 days; higher than 84% of CVEs (scores of 2026-10-31)