CVE-2020-28196

Original summary

Normalized public record · Updated Oct 23, 2026

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.

Publisher and source text is retained separately from QFinch interpretation.

Affected products

Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.

Remediation

Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.

1. Confirm the affected product and reachable code path exist in your environment.
2. Apply the vendor-supported patch or mitigation from the primary advisory.
3. Rescan the exact deployed revision and retain verification evidence.

Evidence coverage

SSVC priority

MEDIUM

Confidence

10%

Aliases

None reported

Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.

Sources and record history

1. [debian-lts-announce] 20201107 [SECURITY] [DLA 2437-1] krb5 security update ↗
2. FEDORA-2020-32193cbbe6 ↗
3. FEDORA-2020-27b577ab23 ↗
4. GLSA-202011-17 ↗
5. FEDORA-2020-0df38b2843 ↗
6. DSA-4795 ↗
7. www.oracle.com ↗
8. security.netapp.com ↗
9. Patch commit ↗
10. security.netapp.com ↗
11. [bookkeeper-issues] 20210628 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 ↗
12. [bookkeeper-issues] 20210629 [GitHub] [bookkeeper] padma81 opened a new issue #2746: Security Vulnerabilities in CentOS 7 image, Upgrade image to CentOS 8 ↗

Record history

Published Nov 6, 2020 · Last refreshed Oct 23, 2026