CVE-2021-29945 : What You Need to Know

A detailed overview of CVE-2021-29945, a vulnerability affecting Firefox ESR, Thunderbird, and Firefox.

Understanding CVE-2021-29945

This CVE highlights a WebAssembly JIT issue that could potentially lead to a crash due to a miscalculation in return type size on x86-32 platforms.

What is CVE-2021-29945?

The vulnerability in the WebAssembly JIT component could trigger a null read, causing a crash. It specifically impacts Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

The Impact of CVE-2021-29945

The vulnerability may lead to a crash due to an incorrect computation of return type size in WebAssembly JIT, affecting specific versions of Firefox ESR, Thunderbird, and Firefox.

Technical Details of CVE-2021-29945

Exploring the specific technical aspects of the CVE.

Vulnerability Description

The vulnerability stems from a miscalculation in the return type's size within the WebAssembly JIT, potentially causing null reads on x86-32 platforms.

Affected Systems and Versions

Firefox ESR version < 78.10, Thunderbird version < 78.10, and Firefox version < 88 are susceptible to this vulnerability.

Exploitation Mechanism

Exploiting this vulnerability involves triggering a null read by manipulating the return type size miscalculation, leading to a crash.

Mitigation and Prevention

Effective strategies to mitigate and prevent the exploitation of CVE-2021-29945.

Immediate Steps to Take

Users should update to the latest versions of Firefox ESR, Thunderbird, and Firefox to address this vulnerability. Ensure timely security patches are applied.

Long-Term Security Practices

Implement regular software updates and security patches to stay protected from potential vulnerabilities like CVE-2021-29945. Consider security best practices and proactive measures.

Patching and Updates

Stay informed about security advisories from Mozilla and promptly apply recommended patches and updates to safeguard against known vulnerabilities.