CVE-2021-23180

Publication date 3 June 2021

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
htmldoc	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Fixed 1.9.11-2ubuntu0.1
	20.10 groovy	Ignored end of life
	20.04 LTS focal	Fixed 1.9.7-1ubuntu0.2
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Vulnerable

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-5198-1
HTMLDOC vulnerability
16 December 2021