CVE-2021-44758

Publication date 26 December 2022

Last updated 11 July 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
heimdal	25.10 questing	Vulnerable
	25.04 plucky	Vulnerable
	24.10 oracular	Ignored end of life, was needed
	24.04 LTS noble	Vulnerable
	23.10 mantic	Ignored end of life, was needed
	23.04 lunar	Ignored end of life, was needed
	22.10 kinetic	Ignored end of life, was needed
	22.04 LTS jammy	Vulnerable
	20.04 LTS focal	Fixed 7.7.0+dfsg-1ubuntu1.3
	18.04 LTS bionic	Fixed 7.5.0+dfsg-1ubuntu0.3
	16.04 LTS xenial	Fixed 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
	14.04 LTS trusty	Fixed 1.6~git20131207+dfsg-1ubuntu1.2+esm3

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Notes

rodrigo-zaiden

the fix commit solely can cause build failures on tests, a follow-up commit to fix it should be 953d9442.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
heimdal	Upstream: f9ec700

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-5800-1
Heimdal vulnerabilities
12 January 2023