What’s Vulnerable › Vulnerabilities

CVE-2021-37750

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-08-23 · updated 2026-10-14
• Weakness: CWE-476

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.

Affected products

• Debian Linux: 9.0
• Fedoraproject Fedora: 33
• MIT Kerberos 5: before 1.18.5; from 1.19.0 before 1.19.3 — fixed in 1.18.5, 1.19.3
• Oracle Communications Cloud Native Core Network Slice Selection Function: 22.1.0
• Starwindsoftware Starwind Virtual San: v8r13-14338

How to fix

Upgrade to a fixed version: MIT Kerberos 5 1.18.5, 1.19.3. Check the vendor advisory for mitigations.

References

• https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
• https://github.com/krb5/krb5/releases
• https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/
• https://security.netapp.com/advisory/ntap-20210923-0002/
• https://web.mit.edu/kerberos/advisories/
• https://www.oracle.com/security-alerts/cpujul2022.html
• https://www.starwindsoftware.com/security/sw-20220817-0004/
• https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49
• https://github.com/krb5/krb5/releases
• https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/

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