Mozilla Firefox/Firefox ESR/Thunderbird Cursor improper restriction of rendered ui layers

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.8$5k-$25k0.00

A vulnerability, which was classified as problematic, has been found in Mozilla Firefox, Firefox ESR and Thunderbird (Web Browser) (affected version not known). Affected by this issue is some unknown functionality of the component Cursor Handler. The manipulation with an unknown input leads to a privilege escalation vulnerability. Using CWE to declare the problem leads to CWE-269. Impacted is confidentiality, integrity, and availability. CVE summarizes:

It was possible to recreate previous cursor spoofing attacks against users with a zoomed native cursor. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

The weakness was presented 12/09/2021. The advisory is shared for download at mozilla.org. This vulnerability is handled as CVE-2021-43546 since 11/08/2021. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $5k-$25k (estimation calculated on 12/12/2021).

Upgrading eliminates this vulnerability.

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CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.8

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

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

Exploitinginfoedit

Class: Privilege escalation
CWE: CWE-1021
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: mozilla.org

Timelineinfoedit

11/08/2021 CVE assigned
12/09/2021 +31 days Advisory disclosed
12/09/2021 +0 days VulDB entry created
12/12/2021 +3 days VulDB last update

Sourcesinfoedit

Vendor: https://www.mozilla.org/

Advisory: mozilla.org
Status: Confirmed

CVE: CVE-2021-43546 (🔒)

Entryinfoedit

Created: 12/09/2021 09:00 AM
Updated: 12/12/2021 02:39 AM
Changes: (1) source_cve_nvd_summary
Complete: 🔍

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