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CVE-2018-20217

MEDIUM
5.3
CVSS Score
Published: December 26, 2018 at 08:00 PM UTC
Updated: June 17, 2026 at 01:52 AM UTC
2 products affected across 2 vendorsDebian LinuxKerberos

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Severity
MEDIUM5.3
Exploit prediction
EPSS 1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
8.09.0
Kerberos· Mit
95%
v < 5-1.17
Affected range stops below 5-1.17, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8763
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/krb5/krb5/commit/5e6d1796106df8ba6bc1973ee0917c170d929086
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2019/01/msg00020.html
Mailing Listx_refsource_MLISTThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KNHELH4YHNT6H2ESJWX2UIDXLBNGB2O/
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://security.netapp.com/advisory/ntap-20190416-0006/

CVSS

5.3MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
HIGH
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-617

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