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Vulnerability record · CVE-2021-37750 · published 23 August 2021

CVE-2021-37750: Mit kerberos 5 null pointer dereference vulnerability

Mit · Kerberos 5

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.

6.5 CVSS 3.1 Medium EPSS 2.2% · top 18.5% CWE-476 · NULL pointer dereference
6.5CVSS 3.1 base score, v2 4.0
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

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.

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49 PatchThird Party Advisory
https://github.com/krb5/krb5/releases Release NotesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5
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.html PatchThird Party Advisory
https://www.starwindsoftware.com/security/sw-20220817-0004/ Third Party Advisory
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49 PatchThird Party Advisory
https://github.com/krb5/krb5/releases Release NotesThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5
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.html PatchThird Party Advisory
https://www.starwindsoftware.com/security/sw-20220817-0004/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-37750), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.