CVE-2021-29952 Race condition in Firefox

What is CVE-2021-29952?

CVE-2021-29952 is a high-severity vulnerability in Mozilla Firefox, published on 24 Jun 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

When Web Render components were destructed, a race condition could have caused undefined behavior, and we presume that with enough effort may have been exploitable to run arbitrary code. This vulnerability affects Firefox < 88.0.1 and Firefox for Android < 88.1.3.

Weakness: CWE-362

Which versions are affected by CVE-2021-29952?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2021-29952?

Upgrade to a fixed version.

Is CVE-2021-29952 being exploited?

There is no known exploitation of CVE-2021-29952 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-37c3-xqfq-pgfj, UBUNTU-CVE-2021-29952, USN-4942-1.