CVE-2018-20217

A Reachable Assertion issue was discovered in the KDC in MIT Kerberos 5 (aka krb5) before 1.17. If an attacker can obtain a krbtgt ticket using an older encryption type (single-DES, triple-DES, or RC4), the attacker can crash the KDC by making an S4U2Self request.

• CWE-617

• http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763Patch, Third Party Advisory
• https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/01/msg00020.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
• https://security.netapp.com/advisory/ntap-20190416-0006/Third Party Advisory
• http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763Patch, Third Party Advisory
• https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086Patch, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2019/01/msg00020.htmlMailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List, Third Party Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
• https://security.netapp.com/advisory/ntap-20190416-0006/Third Party Advisory

Published

Dec 26, 2018

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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