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CVE-2021-37750 MIT Kerberos 5

Affected softwareMIT Kerberos 5
Severity6.5 Medium CVSS 3.1 2 scores
WeaknessCWE-476
Published23 Aug 2021
Updated14 Oct 2026

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.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 5 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment no assessment published
  • Indexed PoC none indexed
  • EPSS 2.5% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review human Researcher
  • Record active
Decided by Manual classification of this CVE in the legacy dataset
Finding A manual classification set this CVE's status to Outside Waratek scope, but the CVE names a tracked product.

CVSS

6.5 MEDIUM v3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.5 MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 2.0 4.0 none AV:N/AC:L/Au:S/C:N/I:N/A:P NVD Primary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Patch Update July 2022 ↗ CPU 2022-Q3 Oracle Communications / NSSF (MIT Kerberos) (22.1.1)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications NSSF (MIT Kerberos) 22.1.1 22.1.1

Products and versions

5 products, 6 version entries
SourceVendorProductSchemeAffected versions
nvd debian debian linux generic 9.0
nvd fedoraproject fedora generic 33
nvd mit kerberos 5 generic < 1.18.5 · ≥ 1.19.0 and < 1.19.3
nvd oracle communications cloud native core network slice selection function generic 22.1.0
nvd starwindsoftware starwind virtual san generic v8r13:14338

References

URLTags
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49 Patch, Third Party Advisory
https://github.com/krb5/krb5/releases Release Notes, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/
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 Patch, Third Party Advisory
https://www.starwindsoftware.com/security/sw-20220817-0004/ Third Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-398330.html

Timeline

Published2021-08-23By the CVE Program.
NVD record modified2026-10-14NVD's own last-modified date for this record.