CVE-2021-37750
MEDIUMCVSS 6.5/10EPSS 2.17%
Last modified
CVE-2021-37750 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.. EPSS estimates a 2.17% chance of exploitation in the next 30 days.
Description
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Mit | Kerberos 5 | < 1.18.5 | — |
| Mit | Kerberos 5 | >= 1.19.0, < 1.19.3 | — |
| Fedoraproject | Fedora | 33 | — |
| Debian | Debian Linux | 9.0 | — |
| Starwindsoftware | Starwind Virtual San | v8r13 | 14338 |
| Oracle | Communications Cloud Native Core Network Slice Selection Function | 22.1.0 | — |
References
- https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49Patch, Third Party Advisory
- https://github.com/krb5/krb5/releasesRelease Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210923-0002/Third Party Advisory
- https://web.mit.edu/kerberos/advisories/Vendor Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://www.starwindsoftware.com/security/sw-20220817-0004/Third Party Advisory
- https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49Patch, Third Party Advisory
- https://github.com/krb5/krb5/releasesRelease Notes, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/09/msg00019.htmlMailing List, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210923-0002/Third Party Advisory
- https://web.mit.edu/kerberos/advisories/Vendor Advisory
- https://www.oracle.com/security-alerts/cpujul2022.htmlPatch, Third Party Advisory
- https://www.starwindsoftware.com/security/sw-20220817-0004/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-37750?
The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.
How severe is CVE-2021-37750?
CVE-2021-37750 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.17% probability of exploitation in the next 30 days.
How do I fix CVE-2021-37750?
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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