CVE-2023-21720 Microsoft Edge (Chromium-based) Tampering Vulnerability

Medium 5.3 Published 14 Feb 2023 Updated 19 Aug 2026

An attacker can exploit a memory corruption flaw in Microsoft Edge to execute arbitrary code, requiring users to apply the latest security patch.

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-2023-21720?

CVE-2023-21720 is a medium-severity memory corruption vulnerability in Microsoft Edge Chromium, published on 14 Feb 2023. 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) Tampering Vulnerability

Weakness: CWE-126

Which versions are affected by CVE-2023-21720?

It affects 1 product.

Products include Microsoft Edge Chromium.

How do I fix CVE-2023-21720?

No fix has been published for CVE-2023-21720 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2023-21720 being exploited?

There is no known exploitation of CVE-2023-21720 in the wild and no public exploit code.

All Microsoft Edge Chromium vulnerabilities

Sources

Also known as GHSA-rwj7-xp4r-5r27.