CVE-2020-21896

Publication date 22 August 2023

Last updated 17 October 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A Use After Free vulnerability in svg_dev_text_span_as_paths_defs function in source/fitz/svg-device.c in Artifex Software MuPDF 1.16.0 allows remote attackers to cause a denial of service via opening of a crafted PDF file.

Read the notes from the security team

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
	22.04 LTS jammy	Not affected
	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	Not affected
	14.04 LTS trusty	Ignored end of standard support

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Notes

shishirsub10

mupdf in xenial does not have draw param

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