CVE-2018-20217

MEDIUM EPSS 71.5%
Published Dec 26, 20187y ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Dec 26, 2018 7y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.3
Exploitability
1.6
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
71.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-617

Affected Products 3

VendorProductVersionRange
mitkerberos* <5-1.17
debiandebian_linux8.0any
debiandebian_linux9.0any

References 6

  • krbdev.mit.edu http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
    PatchThird Party Advisory
  • github.com https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086
    PatchThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html
    Mailing ListThird Party Advisory
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
    Mailing ListThird Party Advisory
  • lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
  • security.netapp.com https://security.netapp.com/advisory/ntap-20190416-0006/
    Third Party Advisory

Remediation

  • krbdev.mit.edu http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
    PatchThird Party Advisory
  • github.com https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086
    PatchThird Party Advisory