Vulnerability Monitor

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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.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 5 products from mit, from fedoraproject, from debian and 2 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2021, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2021-08-23T05:15:08.063

Last Modified

2024-11-21T06:15:52.080

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

CVSSv2 Vector

AV:N/AC:L/Au:S/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: SINGLE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

8.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-476

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	mit	kerberos_5	< 1.18.5	Yes
Application	mit	kerberos_5	< 1.19.3	Yes
Operating System	fedoraproject	fedora	33	Yes
Operating System	debian	debian_linux	9.0	Yes
Application	starwindsoftware	starwind_virtual_san	v8r13	Yes
Application	oracle	communications_cloud_native_core_network_slice_selection_function	22.1.0	Yes

References

https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49 Patch, Third Party Advisory ([email protected])
https://github.com/krb5/krb5/releases Release Notes, Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing List, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/ ([email protected])
https://security.netapp.com/advisory/ntap-20210923-0002/ Third Party Advisory ([email protected])
https://web.mit.edu/kerberos/advisories/ Vendor Advisory ([email protected])
https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory ([email protected])
https://www.starwindsoftware.com/security/sw-20220817-0004/ Third Party Advisory ([email protected])
https://github.com/krb5/krb5/commit/d775c95af7606a51bf79547a94fa52ddd1cb7f49 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/krb5/krb5/releases Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2021/09/msg00019.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/MFCLW7D46E4VCREKKH453T5DA4XOLHU2/ (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20210923-0002/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://web.mit.edu/kerberos/advisories/ Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.starwindsoftware.com/security/sw-20220817-0004/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For mit's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.