Use-after-free in Mozilla Firefox and Firefox ESR - CVE-2021-43539

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in GC rooting when calling wasm instance methods. A remote attacker can trick the victim to open 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.

Remediation

External links

• https://www.mozilla.org/en-US/security/advisories/mfsa2021-52/
• https://www.mozilla.org/en-US/security/advisories/mfsa2021-53/