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…

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.

Scores

EPSS (exploitation in 30 days)

1.4% · top 27% of all CVEs (5 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.

Weakness

• n/a
• CWE-617 (opens in a new tab)All about CWE-617 and its CVEs

Affected products

• n/a

  • affected n/a

References (6)

• FEDORA-2018-7db7ccda4d (opens in a new tab)vendor-advisoryx_refsource_FEDORAx_transferred
• http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763 (opens in a new tab)x_refsource_CONFIRMx_transferred
• https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086 (opens in a new tab)x_refsource_CONFIRMx_transferred
• [debian-lts-announce] 20190125 [SECURITY] [DLA 1643-1] krb5 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred
• https://security.netapp.com/advisory/ntap-20190416-0006/ (opens in a new tab)x_refsource_CONFIRMx_transferred
• [debian-lts-announce] 20210930 [SECURITY] [DLA 2771-1] krb5 security update (opens in a new tab)mailing-listx_refsource_MLISTx_transferred

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2018-20217](https://trackcve.app/badge/CVE-2018-20217.svg)](https://trackcve.app/cve/CVE-2018-20217)

Record last updated 5 Aug 2024, 11:58 UTC.