CVE-2021-29983 : Security Advisory and Response

Firefox for Android could get stuck in fullscreen mode and not exit it even after normal interactions that should cause it to exit. This vulnerability affects Firefox versions less than 91, and it only impacts Firefox for Android.

Understanding CVE-2021-29983

This CVE highlights a specific issue in Firefox for Android that could lead to the browser being stuck in fullscreen mode.

What is CVE-2021-29983?

The CVE-2021-29983 vulnerability pertains to Firefox for Android wherein the browser may fail to exit fullscreen mode despite regular user interactions prompting it to do so.

The Impact of CVE-2021-29983

The impact of this vulnerability is limited to Firefox for Android, causing it to remain in the fullscreen mode when expected to exit, affecting user experience and potentially security.

Technical Details of CVE-2021-29983

This section outlines specific technical details regarding the vulnerability.

Vulnerability Description

The vulnerability enables Firefox for Android to get stuck in fullscreen mode, hindering its normal operation.

Affected Systems and Versions

The affected product is Firefox by Mozilla. Versions less than 91 are impacted, particularly Firefox for Android.

Exploitation Mechanism

The exploitation of this vulnerability involves triggering fullscreen mode in Firefox for Android and observing its failure to exit as intended.

Mitigation and Prevention

To address CVE-2021-29983, specific mitigation and prevention strategies should be followed.

Immediate Steps to Take

Users should update Firefox for Android to version 91 or higher to prevent the fullscreen mode issue.

Long-Term Security Practices

Maintain up-to-date software versions and follow best practices for secure browsing to mitigate similar vulnerabilities in the future.

Patching and Updates

Regularly check for updates from Mozilla and apply patches promptly to ensure security and functionality.