CVE-2020-28196

Name: CVE-2020-28196
Creator: NVD / NIST
Published: 2020-11-06T08:15:13.86+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.37%

Last modified Jun 17, 2026

CVE-2020-28196 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 4.37% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

4.37%

90.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mit	Kerberos 5	< 1.17.2
Mit	Kerberos 5	>= 1.18.0, < 1.18.3
Fedoraproject	Fedora	31
Netapp	Active Iq Unified Manager	All versions
Netapp	Cloud Backup	All versions
Netapp	Oncommand Insight	All versions
Netapp	Oncommand Workflow Automation	All versions
Netapp	Snapcenter	All versions
Oracle	Communications Cloud Native Core Policy	1.14.0
Oracle	Communications Offline Mediation Controller	12.0.0.3.0
Oracle	Communications Pricing Design Center	12.0.0.3.0
Oracle	Mysql Server	<= 8.0.23

References

https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfdPatch, Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/11/msg00011.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73IGOG6CZAVMVNS4GGRMOLOZ7B6QVA7F/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPH2V3WSQTELROZK3GFCPQDOFLKIZ6H5/
https://security.gentoo.org/glsa/202011-17Third Party Advisory
https://security.netapp.com/advisory/ntap-20201202-0001/Third Party Advisory
https://security.netapp.com/advisory/ntap-20210513-0002/Third Party Advisory
https://www.debian.org/security/2020/dsa-4795Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory
https://github.com/krb5/krb5/commit/57415dda6cf04e73ffc3723be518eddfae599bfdPatch, Third Party Advisory
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2020/11/msg00011.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/45KKOZQWIIIW5C45PJVGQ32AXBSYNBE7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/73IGOG6CZAVMVNS4GGRMOLOZ7B6QVA7F/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KPH2V3WSQTELROZK3GFCPQDOFLKIZ6H5/
https://security.gentoo.org/glsa/202011-17Third Party Advisory
https://security.netapp.com/advisory/ntap-20201202-0001/Third Party Advisory
https://security.netapp.com/advisory/ntap-20210513-0002/Third Party Advisory
https://www.debian.org/security/2020/dsa-4795Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.htmlPatch, Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlPatch, Third Party Advisory

Timeline

Published: Nov 6, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-28196?

How severe is CVE-2020-28196?

CVE-2020-28196 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.37% probability of exploitation in the next 30 days.

How do I fix CVE-2020-28196?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-28196?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST