Artifex Mupdf up to 1.19.x muraster.c divide by zero

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability has been found in Artifex Mupdf up to 1.19.x (Document Reader Software) and classified as problematic. Affected by this vulnerability is some unknown processing of the file muraster.c. The manipulation with an unknown input leads to a divide by zero vulnerability. The CWE definition for the vulnerability is CWE-369. The product divides a value by zero. As an impact it is known to affect availability. The summary by CVE is:

A Floating point exception (division-by-zero) flaw was found in Mupdf for zero width pages in muraster.c. It is fixed in Mupdf-1.20.0-rc1 upstream.

The weakness was shared 08/27/2022 as 22c47acbd52949421f8c7cb46ea1556827d0fcbf. The advisory is shared at This vulnerability is known as CVE-2021-4216 since 01/27/2022. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 1.20.0-rc1 eliminates this vulnerability. Applying the patch 22c47acbd52949421f8c7cb46ea1556827d0fcbf is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be upgrading to the latest version.






  • free

CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒



VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍


Class: Divide by zero
CWE: CWE-369 / CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Mupdf 1.20.0-rc1
Patch: 22c47acbd52949421f8c7cb46ea1556827d0fcbf


01/27/2022 CVE reserved
08/27/2022 +211 days Advisory disclosed
08/27/2022 +0 days VulDB entry created
10/02/2022 +36 days VulDB last update



Advisory: 22c47acbd52949421f8c7cb46ea1556827d0fcbf
Status: Confirmed

CVE: CVE-2021-4216 (🔒)


Created: 08/27/2022 08:09 AM
Updated: 10/02/2022 02:24 PM
Changes: 08/27/2022 08:09 AM (44), 10/02/2022 02:24 PM (11)
Complete: 🔍


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