FAQ
What privileges could be gained by an attacker who successfully exploited this vulnerability? An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
MSRC compact vulnerability detail
CVE-2025-21331 · Windows Installer Elevation of Privilege Vulnerability
No description was published by MSRC.
Signals
Windows Installer
Elevation of Privilege
Exploited: No
Publicly disclosed: No
Exploitability: Exploitation Less Likely
CWE
Patch Diff
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Resolved binary override
Use this when the MSRC module name cannot be mapped automatically or the resolved binary looks wrong.
Description
No description was published by MSRC.
FAQ / Articles
FAQ
According to the CVSS metric, user interaction is required (UI:R). What interaction would the user have to do? Successful exploitation of this vulnerability by an attacker requires a user to first reboot their machine.
FAQ
Are there any additional steps that I need to follow to be protected from this vulnerability? The changes to address this vulnerability updated Virtual Secure Mode components. The policy described in Guidance for blocking rollback of Virtualization-based Security (VBS) related security updates has been updated to account for the latest changes. If you deployed this policy, then you'll need to redeploy using the updated policy.