CVE-2018-20217

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-617

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

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

Timeline

Published: Dec 26, 2018
Last modified: Jun 17, 2026
NVD status: Modified

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