Use-after-free in Mozilla Firefox and Firefox ESR - CVE-2021-38496

Detailed vulnerability description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error during operations on MessageTasks. A remote attacker can trick the victim to visit a specially crafted web page, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

How to mitigate CVE-2021-38496

Sources

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-44/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-45/