VDB-207409 · CVE-2021-4216 · GCVE-0-2021-4216

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

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.8	$0-$5k	0.14

Summaryinfo

A vulnerability was found in Artifex Mupdf up to 1.19.x and classified as problematic. Affected by this issue is some unknown functionality of the file muraster.c. The manipulation leads to divide by zero. This vulnerability is handled as CVE-2021-4216. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Detailsinfo

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 github.com. 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 github.com. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Document Reader Software

Vendor

Artifex

Name

Mupdf

Version

License

commercial

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

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: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

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

Exploitinginfo

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

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Mupdf 1.20.0-rc1
Patch: 22c47acbd52949421f8c7cb46ea1556827d0fcbf

Timelineinfo

01/27/2022 🔍
08/27/2022 +211 days 🔍
08/27/2022 +0 days 🔍
10/02/2022 +36 days 🔍

Sourcesinfo

Vendor: artifex.com

Advisory: 22c47acbd52949421f8c7cb46ea1556827d0fcbf
Status: Confirmed

CVE: CVE-2021-4216 (🔍)
GCVE (CVE): GCVE-0-2021-4216
GCVE (VulDB): GCVE-100-207409

Entryinfo

Created: 08/27/2022 08:09
Updated: 10/02/2022 14:24
Changes: 08/27/2022 08:09 (44), 10/02/2022 14:24 (11)
Complete: 🔍
Cache ID: 216:BF6:103