CVE-2020-28196

HIGHNVD 7.57.5—

7.5

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.

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 58.7%
KEV: Not listed

Published

November 6, 2020

Last Modified

December 3, 2025

References (28)

Patch Availability(3)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	libkrb5support0 (1.17-10ubuntu0.1) @ groovy	2026-05-23	ubuntu
redhat	redhat-virtualization-host-0:4.4.6-20210527.3.el8_4	2021-06-03	redhat
redhat	krb5-0:1.18.2-8.el8	2021-05-18	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-674Uncontrolled Recursion

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 05:37 UTCEG score recompute
2026-05-23 05:37 UTCVendor advisory
2026-05-23 05:37 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2020-28196?

CVE-2020-28196 is a high vulnerability published on November 6, 2020. 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.

When was CVE-2020-28196 disclosed?

CVE-2020-28196 was first published in the National Vulnerability Database on November 6, 2020, with the most recent update on December 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-28196 actively exploited?

CVE-2020-28196 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 58.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

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

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

How do I remediate CVE-2020-28196?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-28196, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-28196

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CVE-2020-28196

Published

Last Modified

References (28)

Patch Availability(3)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-28196?

Same vendor

Same CWE

CVE-2020-28196

📅 Published

🔄 Last Modified

🔗 References (28)

Patch Availability(3)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-28196?

🔗 Related CVEs(same vendor + same CWE)

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Published

Last Modified

References (28)

Frequently asked(5)

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