Is CVE-2018-20217 in the CISA KEV catalog?

No. CVE-2018-20217 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2018-20217?

CVE-2018-20217 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2018-20217?

CVE-2018-20217 has an EPSS score of 1.42% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2018-20217?

Upgrade krb5 on debian 11 to 1.16.2-1 or later. Fixes are available for 10 affected products.

CVE & CISA-KEV Catalog

CVE-2018-20217

MEDIUM

5.3

CVSS v3

NVD

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.

CWE-617

How to fix

Remediation Available

krb5Debian

Fixed in:1.16.2-1CVE-2018-20217

krb5Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm3USN-5828-1

Fixed in:1.13.2+dfsg-5ubuntu2.2+esm3USN-5828-1

Fixed in:1.16-2ubuntu0.3USN-5828-1

Fixed in:1.17-6ubuntu4.2USN-5828-1

Fixed in:1.19.2-2ubuntu0.1USN-5828-1

Fixed in:1.20-1ubuntu0.1USN-5828-1

krb5-admin-serverUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm3USN-5828-1

Fixed in:1.13.2+dfsg-5ubuntu2.2+esm3USN-5828-1

Fixed in:1.16-2ubuntu0.3USN-5828-1

Fixed in:1.17-6ubuntu4.2USN-5828-1

Fixed in:1.19.2-2ubuntu0.1USN-5828-1

Fixed in:1.20-1ubuntu0.1USN-5828-1

krb5-kdcUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm3USN-5828-1

Fixed in:1.13.2+dfsg-5ubuntu2.2+esm3USN-5828-1

Fixed in:1.16-2ubuntu0.3USN-5828-1

Fixed in:1.17-6ubuntu4.2USN-5828-1

Fixed in:1.19.2-2ubuntu0.1USN-5828-1

Fixed in:1.20-1ubuntu0.1USN-5828-1

krb5-userUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm3USN-5828-1

Fixed in:1.13.2+dfsg-5ubuntu2.2+esm3USN-5828-1

Fixed in:1.16-2ubuntu0.3USN-5828-1

Fixed in:1.17-6ubuntu4.2USN-5828-1

Fixed in:1.19.2-2ubuntu0.1USN-5828-1

Fixed in:1.20-1ubuntu0.1USN-5828-1

libgssapi-krb5-2Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm3USN-5828-1

Fixed in:1.13.2+dfsg-5ubuntu2.2+esm3USN-5828-1

Fixed in:1.16-2ubuntu0.3USN-5828-1

Fixed in:1.17-6ubuntu4.2USN-5828-1

Fixed in:1.19.2-2ubuntu0.1USN-5828-1

Fixed in:1.20-1ubuntu0.1USN-5828-1

libkdb5-10Ubuntu

Fixed in:1.19.2-2ubuntu0.1USN-5828-1

Fixed in:1.20-1ubuntu0.1USN-5828-1

libkdb5-7Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm3USN-5828-1

libkdb5-8Ubuntu

Fixed in:1.13.2+dfsg-5ubuntu2.2+esm3USN-5828-1

libkdb5-9Ubuntu

Fixed in:1.16-2ubuntu0.3USN-5828-1

Fixed in:1.17-6ubuntu4.2USN-5828-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.42%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Patch2

Third-Party Advisory3

Other references1

lists.fedoraproject.org

Related Vulnerabilities

Other CWE-617 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-8617	High	7.5	93%	-	Fix
CVE-2020-36222	High	7.5	78%	-	Fix
CVE-2006-5779	High	7.5	75%	-	Fix
CVE-2021-27212	High	7.5	64%	-	Fix
CVE-2018-5740	High	7.5	59%	-	Fix
CVE-2023-28425	Medium	5.5	55%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.