CVE-2025-21355 Microsoft Bing Remote Code Execution Vulnerability
An unauthorized attacker can execute code on Microsoft Bing due to missing authentication for a critical function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-21355?
CVE-2025-21355 is a high-severity missing authorization vulnerability in Microsoft Bing, published on 19 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network
Weakness: CWE-306
Which versions are affected by CVE-2025-21355?
It affects 1 product.
Products include Microsoft Bing.
How do I fix CVE-2025-21355?
No fix has been published for CVE-2025-21355 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-21355 being exploited?
There is no known exploitation of CVE-2025-21355 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Bing
Sources
Also known as GHSA-fx4j-9fqf-p9p2.