Is CVE-2020-28196 in the CISA KEV catalog?

No. CVE-2020-28196 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-28196?

CVE-2020-28196 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2020-28196?

CVE-2020-28196 has an EPSS score of 4.37% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-28196?

Upgrade krb5 on debian 11 to 1.18.3-1 or later. Fixes are available for 26 affected products.

CVE & CISA-KEV Catalog

CVE-2020-28196

HIGHEPSS 90th pctl

7.5

CVSS v3

NVD

Description

MIT Kerberos 5 (aka krb5) before 1.17.2 and 1.18.x before 1.18.3 allows unbounded recursion via an ASN.1-encoded Kerberos message because the lib/krb5/asn.1/asn1_encode.c support for BER indefinite lengths lacks a recursion limit.

CWE-674

How to fix

Remediation Available

krb5Debian

Fixed in:1.18.3-1CVE-2020-28196

krb5Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-admin-serverUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-k5tlsUbuntu

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-kdcUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-kdc-ldapUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-kpropdUbuntu

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-localesUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-multidevUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-otpUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-pkinitUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

krb5-userUbuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libgssapi-krb5-2Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libgssrpc4Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libk5crypto3Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libkadm5clnt-mit11Ubuntu

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libkadm5clnt-mit9Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

libkadm5srv-mit11Ubuntu

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libkadm5srv-mit8Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

libkadm5srv-mit9Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

libkdb5-7Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

libkdb5-8Ubuntu

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

libkdb5-9Ubuntu

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libkrad0Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libkrb5-3Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

libkrb5support0Ubuntu

Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

Fixed in:1.16-2ubuntu0.2USN-4635-1

Fixed in:1.17-6ubuntu4.1USN-4635-1

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 ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

4.37%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Patch4

Third-Party Advisory5

Other references5

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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 2025-12-03.