CVE-2024-7521 Use after free in Firefox
Incomplete WebAssembly exception handling in Firefox and Thunderbird allows attackers to trigger a use-after-free, potentially leading to arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-7521?
CVE-2024-7521 is a critical use after free vulnerability in Mozilla Firefox, published on 6 Aug 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incomplete WebAssembly exception handing could have led to a use-after-free. This vulnerability affects Firefox < 129, Firefox ESR < 115.14, Firefox ESR < 128.1, Thunderbird < 128.1, and Thunderbird < 115.14.
Weakness: CWE-755
Which versions are affected by CVE-2024-7521?
It affects 3 products.
Products include Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird.
How do I fix CVE-2024-7521?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2024-7521 being exploited?
There is no known exploitation of CVE-2024-7521 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2024-7521, GHSA-563c-g7mm-g4xp, UBUNTU-CVE-2024-7521.