CVE-2021-43546 Explained : Impact and Mitigation

A cursor spoofing vulnerability affecting Thunderbird, Firefox ESR, and Firefox.

Understanding CVE-2021-43546

This CVE describes a cursor spoofing issue that can impact users across various Mozilla products.

What is CVE-2021-43546?

It was possible to execute cursor spoofing attacks on users with a zoomed native cursor in Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

The Impact of CVE-2021-43546

The vulnerability could lead to recreating cursor spoofing attacks on users.

Technical Details of CVE-2021-43546

This section provides in-depth technical details of the CVE.

Vulnerability Description

Cursor spoofing could overlay the user interface when the native cursor is zoomed.

Affected Systems and Versions

Thunderbird < 91.4.0
Firefox ESR < 91.4.0
Firefox < 95

Exploitation Mechanism

Attackers could exploit this vulnerability by executing cursor spoofing attacks on users with a zoomed native cursor.

Mitigation and Prevention

Protecting systems from the CVE and preventing future incidents.

Immediate Steps to Take

Update Thunderbird, Firefox ESR, and Firefox to versions 91.4.0 and above.
Avoid zooming in on the native cursor excessively.

Long-Term Security Practices

Regularly update Mozilla products to the latest versions.
Be cautious while interacting with unknown or suspicious links.

Patching and Updates

Install security patches provided by Mozilla promptly to address this vulnerability.