NULL pointer dereference in Kerberos 5 - CVE-2021-37750

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Main Vulnerability Database Vulnerabilities #VU56828

NULL pointer dereference in Kerberos 5 - CVE-2021-37750

Published: September 22, 2021 / Updated: March 15, 2022


Vulnerability identifier: #VU56828
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-37750
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: MIT
Affected software:
Kerberos 5

Detailed vulnerability description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in the Key Distribution Center (KDC) in kdc/do_tgs_req.c. A remote user can pass specially crafted data via the FAST inner body that lacks a server field, trigger a NULL pointer dereference error and perform a denial of service (DoS) attack.


How to mitigate CVE-2021-37750

Install update from vendor's website.

Sources