CVE-2024-21399 Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

High 8.3 Published 2 Feb 2024 Updated 10 Aug 2026

Attackers can execute arbitrary code via a use-after-free vulnerability in Microsoft Edge, requiring users to apply vendor patches.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2024-21399?

CVE-2024-21399 is a high-severity use after free vulnerability in Microsoft Edge Chromium, published on 2 Feb 2024. 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

Microsoft Edge (Chromium-based) Remote Code Execution Vulnerability

Weakness: CWE-416

Which versions are affected by CVE-2024-21399?

It affects 1 product.

Products include Microsoft Edge Chromium.

How do I fix CVE-2024-21399?

No fix has been published for CVE-2024-21399 yet. Limit exposure of the affected software until one is available.

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-2024-21399 being exploited?

There is no known exploitation of CVE-2024-21399 in the wild and no public exploit code.

All Microsoft Edge Chromium vulnerabilities

Sources

Also known as GHSA-5jxw-j59v-xhxg.