Vulnerability in Mit Kerberos
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.014 (72.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000
Affected products
- Mit Kerberos
- Debian Linux — versions 8.0, 9.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- krbdev.mit.edu/rt/Ticket/Display.html (Patch, Third Party Advisory)
- github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086 (Patch, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2019/01/msg00020.html (mailing-list, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20190416-0006/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2021/09/msg00019.html (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-20217?
- CVE-2018-20217 is a medium-severity vulnerability in Mit Kerberos, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2018-12-26.
- How severe is CVE-2018-20217?
- Medium severity. CVSS v3 base score is 5.3 out of 10.
- Is CVE-2018-20217 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.