Mozilla Firefox up to 94.x WebExtensions permission

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 (≈)
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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.
6.0$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Mozilla Firefox up to 94.x. This issue affects some unknown processing of the component WebExtensions. Such manipulation leads to permission. This vulnerability is uniquely identified as CVE-2021-43540. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 94.x (Web Browser) and classified as critical. Affected by this issue is an unknown part of the component WebExtensions. The manipulation with an unknown input leads to a permission vulnerability. Using CWE to declare the problem leads to CWE-275. Impacted is confidentiality, integrity, and availability.

The weakness was disclosed 12/09/2021. The advisory is available at mozilla.org. This vulnerability is handled as CVE-2021-43540 since 11/08/2021. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 12/09/2021). This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

Upgrading to version 95.0 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Permission
CWE: CWE-275 / CWE-266
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: Firefox 95.0

Timelineinfo

11/08/2021 🔍
12/09/2021 +31 days 🔍
12/09/2021 +0 days 🔍
12/12/2021 +3 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: mozilla.org
Status: Confirmed

CVE: CVE-2021-43540 (🔍)
GCVE (CVE): GCVE-0-2021-43540
GCVE (VulDB): GCVE-100-187862

Entryinfo

Created: 12/09/2021 08:57
Updated: 12/12/2021 01:47
Changes: 12/09/2021 08:57 (41), 12/12/2021 01:47 (1)
Complete: 🔍
Cache ID: 216::103

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