CVE-2017-7562: An authentication bypass flaw was found in the way krb5's certauth interface before 1.16.1 handled the vali...

Security readout for executives and security teams

This flaw affects MIT krb5 certificate-based authentication handling. In uncommon misconfiguration or error conditions, an attacker who can reach the Kerberos KDC could potentially impersonate another principal. The business risk is unauthorized access to systems that trust Kerberos identity assertions. Exposure is most likely in environments running MIT krb5 KDCs with certificate authentication paths that use the affected certauth interface. Internet exposure is not required, but attackers must be able to communicate with the KDC. Vendor package backports may affect version-based checks. Schedule remediation through normal security patching, with higher priority for identity infrastructure serving sensitive systems. This is not marked as actively exploited, but authentication bypass in Kerberos can have outsized impact if the rare vulnerable conditions exist. Mitigation focus: Inventory MIT krb5 and KDC packages across authentication infrastructure.; Upgrade krb5 to 1.16.1 or a vendor-fixed package where applicable.; Apply vendor guidance, including Red Hat RHSA-2018:0666 for affected Red Hat systems..

Prepared

May 24, 2026, 20:29 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.