CVE-2021-37220

Publication date 21 July 2021

Last updated 17 October 2025

Ubuntu priority

Cvss 3 Severity Score

Description

MuPDF through 1.18.1 has an out-of-bounds write because the cached color converter does not properly consider the maximum key size of a hash table. This can, for example, be seen with crafted "mutool draw" input.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
mupdf	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Ignored end of life, was needs-triage
	24.04 LTS noble	Not affected
	23.10 mantic	Ignored end of life, was needs-triage
	23.04 lunar	Ignored end of life, was needs-triage
	22.10 kinetic	Ignored end of life, was needs-triage
	22.04 LTS jammy	Not affected
	21.10 impish	Ignored end of life
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 1.16.1+ds1-1ubuntu1+esm1
	18.04 LTS bionic	Fixed 1.12.0+ds1-1ubuntu0.1~esm1
	16.04 LTS xenial	Ignored backporting risks regression
	14.04 LTS trusty	Not in release

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Severity score breakdown

Parameter	Value
Base score	5.5 · Medium
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-7825-1
MuPDF vulnerabilities
16 October 2025