CVE-2020-28196
HIGHCVSS 7.5/10EPSS 4.37%
Last modified
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/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.debian.org/debian-lts-announce/2020/11/msg00011.htmlMailing List, Third Party Advisory
- 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.debian.org/debian-lts-announce/2020/11/msg00011.htmlMailing List, Third Party Advisory
- 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
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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_encode.c support for BER indefinite lengths lacks a recursion limit.
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-28196?
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Scan your code nowSource: NVD / NIST