What’s Vulnerable › Vulnerabilities

CVE-2021-44758

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-26 · updated 2026-06-17
• Weakness: CWE-476

Description

Heimdal before 7.7.1 allows attackers to cause a NULL pointer dereference in a SPNEGO acceptor via a preferred_mech_type of GSS_C_NO_OID and a nonzero initial_response value to send_accept.

Affected products

• Heimdal Software Kerberos: before 7.7.1 — fixed in 7.7.1

How to fix

Upgrade to a fixed version: Heimdal Software Kerberos 7.7.1. Check the vendor advisory for mitigations.

References

• https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
• https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
• https://security.gentoo.org/glsa/202310-06
• https://github.com/heimdal/heimdal/commit/f9ec7002cdd526ae84fbacbf153162e118f22580
• https://github.com/heimdal/heimdal/security/advisories/GHSA-69h9-669w-88xv
• https://security.gentoo.org/glsa/202310-06

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