CVE & CISA-KEV Catalog

CVE-2020-28196

HIGHEPSS 91th 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
krb5-debuginfoAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5-develAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5-libsAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5-pkinitAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5-serverAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5-server-ldapAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5-workstationAmazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
libkadm5Amazon
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
Fixed in:0:1.15.1-37.amzn2.2.3
krb5Debian
Fixed in:1.18.3-1CVE-2020-28196
Fixed in:1.18.3-1CVE-2020-28196
Fixed in:1.18.3-1CVE-2020-28196
krb5Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-admin-serverUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-k5tlsUbuntu
Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-kdcUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-kdc-ldapUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-kpropdUbuntu
Fixed in:1.16-2ubuntu0.2USN-4635-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-localesUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-multidevUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-otpUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-pkinitUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

krb5-userUbuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libgssapi-krb5-2Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libgssrpc4Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libk5crypto3Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

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

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libkadm5clnt-mit11Ubuntu
Fixed in:1.16-2ubuntu0.2USN-4635-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libkadm5clnt-mit9Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

libkadm5srv-mit11Ubuntu
Fixed in:1.16-2ubuntu0.2USN-4635-1

This Ubuntu release reached end-of-life on 2023-05-31. Extended security maintenance is available until 2028-04-01.

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

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

libkadm5srv-mit8Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

libkadm5srv-mit9Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

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

This Ubuntu release reached end-of-life on 2021-04-02.

libkdb5-7Ubuntu
Fixed in:1.12+dfsg-2ubuntu5.4+esm2USN-4635-1

This Ubuntu release reached end-of-life on 2019-04-02.

libkdb5-8Ubuntu
Fixed in:1.13.2+dfsg-5ubuntu2.2USN-4635-1

This Ubuntu release reached end-of-life on 2021-04-02.

This vulnerability affects an unusually large number of packages. The highest-confidence fixes are shown above; the full list is longer. Check the referenced advisories for complete coverage.

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

4.42%probability of exploitation in 30 days
91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Related Vulnerabilities

Other CWE-674 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2021-45105Medium5.9100%-Fix
CVE-2024-25111High8.665%-Fix
CVE-2023-50269High8.658%-Fix
CVE-2021-42697High7.536%-Fix
CVE-2018-0739Medium6.519%-Fix
CVE-2007-1285High7.518%-Fix

Common questions

How do I fix CVE-2020-28196?

Published advisories record a fix for 34 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2020-28196 being actively exploited?

Not that we know of. CVE-2020-28196 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 4.4% is the estimated probability that it will be exploited in the next 30 days. That is higher than 91% of all scored CVEs.

How severe is CVE-2020-28196?

CVE-2020-28196 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-28196 affect?

Published advisories record a fix for krb5-debuginfo (Amazon), krb5-devel (Amazon), krb5-libs (Amazon), krb5-pkinit (Amazon), and 30 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2026-06-17.