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CVE-2025-21355 · Microsoft Bing Remote Code Execution Vulnerability

Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network

Severity
Critical
Impact
Remote Code Execution
CVSS
8.6 base · 7.7 temporal
Release
2025-02-19
Signals
Microsoft Bing Remote Code Execution Exploited: No Publicly disclosed: No Exploitability: N/A
CWE
CWE-306: Missing Authentication for Critical Function
Patch Diff
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Description
Missing Authentication for Critical Function in Microsoft Bing allows an unauthorized attacker to execute code over a network
FAQ / Articles
FAQ
Why are there no links to an update or instructions with steps that must be taken to protect from this vulnerability? This vulnerability has already been fully mitigated by Microsoft. There is no action for users of this service to take. The purpose of this CVE is to provide further transparency. Please see Toward greater transparency: Unveiling Cloud Service CVEs for more information.