VDB-233323 · CVE-2021-33796 · GCVE-0-2021-33796

MuJS up to 1.1.1 Regexp Source Property denial of service

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.
7.5	$0-$5k	0.00

Summaryinfo

A vulnerability classified as problematic has been found in MuJS up to 1.1.1. This affects an unknown part of the component Regexp Source Property Handler. This manipulation causes denial of service. This vulnerability appears as CVE-2021-33796. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in MuJS up to 1.1.1. It has been declared as problematic. Affected by this vulnerability is some unknown processing of the component Regexp Source Property Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

In MuJS before version 1.1.2, a use-after-free flaw in the regexp source property access may cause denial of service.

The weakness was presented 07/08/2023 as 7ef066a3bb95bf83e7c5be50d859e62e58fe8515. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2021-33796 since 06/02/2021. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 1.1.2 eliminates this vulnerability. Applying the patch 7ef066a3bb95bf83e7c5be50d859e62e58fe8515 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.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Name

MuJS

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CNA Base Score: 10.0
CNA Vector (Fedora Project): 🔍

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: MuJS 1.1.2
Patch: 7ef066a3bb95bf83e7c5be50d859e62e58fe8515

Timelineinfo

06/02/2021 🔍
07/08/2023 +766 days 🔍
07/08/2023 +0 days 🔍
07/25/2023 +17 days 🔍

Sourcesinfo

Advisory: 7ef066a3bb95bf83e7c5be50d859e62e58fe8515
Status: Confirmed

CVE: CVE-2021-33796 (🔍)
GCVE (CVE): GCVE-0-2021-33796
GCVE (VulDB): GCVE-100-233323

Entryinfo

Created: 07/08/2023 08:34
Updated: 07/25/2023 15:45
Changes: 07/08/2023 08:34 (51), 07/25/2023 15:45 (10)
Complete: 🔍
Cache ID: 216::103