Summary
Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.
Details
According to the CVSS metric, the attack vector is network (AV:N) and the user interaction is required (UI:R). What is the target context of the remote code execution?
This attack requires an authenticated client to click a link so that an unauthenticated attacker can initiate remote code execution.
How could an attacker exploit the vulnerability?
An attacker could exploit the vulnerability by controlling subsequent memory allocation after a double free error occurs. This could potentially allow the attacker to execute arbitrary code, leading to remote code execution.
Security updates
10.0.17763.6775 — https://support.microsoft.com/help/5050008
10.0.20348.3091 — https://support.microsoft.com/help/5049983
10.0.19044.5371 — https://support.microsoft.com/help/5049981
10.0.22621.4751 — https://support.microsoft.com/help/5050021
10.0.25398.1369 — https://support.microsoft.com/help/5049984
Vulnerabilities 1
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High 8.8
Windows Direct Show Remote Code Execution Vulnerability
Windows Direct Show Remote Code Execution Vulnerability
Revision history
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#1
Information published.
References
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CVE-2025-21291 Windows Direct Show Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21291
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Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
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Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
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Common Vulnerability Scoring System
https://www.first.org/cvss