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Vulnerabilities

Vulnerability · CVE-2020-28196

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_encod…

Published Nov 6, 2020 · catalog updated Oct 14, 2026 · kerberos 5

Check if you run it

No confirmed exploitation is on record for CVE-2020-28196. EPSS is 4.42%. Act only if a listed version of kerberos 5 is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
4.42%
Remediation
Advisory link
Affected products
cpe fedoraproject/fedora · cpe mit/kerberos 5 · cpe netapp/active iq unified manager · cpe netapp/cloud backup · cpe netapp/oncommand insight · cpe netapp/oncommand workflow automation

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe fedoraproject/fedora31
  • cpe mit/kerberos 5version unspecified
  • cpe netapp/active iq unified managerversion unspecified
  • cpe netapp/cloud backupversion unspecified
  • cpe netapp/oncommand insightversion unspecified
  • cpe netapp/oncommand workflow automationversion unspecified
  • cpe oracle/communications cloud native core policy1.14.0

How to fix CVE-2020-28196

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2020-28196. EPSS is 4.42%. Act only if a listed version of kerberos 5 is installed.

Which versions are affected?

Compare what you have installed with oracle/communications cloud native core policy 1.14.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-674. EPSS 4.42%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 6, 2020 · NIST NVD

    Detected

    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.

  2. Oct 14, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2020-28196

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-28196

    30-day exploitation probability 4.42%

    first.org
  • NIST NVDVulnerability recordCVE-2020-28196

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 24, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.