CVE-2019-17021 Race condition in Firefox

What is CVE-2019-17021?

CVE-2019-17021 is a medium-severity vulnerability in Mozilla Firefox, published on 8 Jan 2020. 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

During the initialization of a new content process, a race condition occurs that can allow a content process to disclose heap addresses from the parent process. *Note: this issue only occurs on Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

Weakness: CWE-362

Which versions are affected by CVE-2019-17021?

It affects 3 products.

Products include Mozilla Firefox, Mozilla Firefox Esr, Opensuse Leap.

How do I fix CVE-2019-17021?

Upgrade to a fixed version.

Is CVE-2019-17021 being exploited?

There is no known exploitation of CVE-2019-17021 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-23vm-fc59-7qjv, UBUNTU-CVE-2019-17021.