Windows Hyper-V VSP: privilege escalation (CVE-2025-21335)

high severity · exploited in the wild · published 2025-01-14

An attacker who already runs code as a normal user can raise their rights to a much higher level and take over the PC. Attackers already use this flaw in the wild.

Fixed in: 10.0.26100.2894

CVE: CVE-2025-21335

Source: Microsoft (MSRC)

Am I affected?

You are affected if the installed version is older than 10.0.26100.2894. Check the version you have and update to 10.0.26100.2894 or later. The fixed version is verified against a vendor or advisory source.

Get the fix

FixLane has a reviewed fix procedure for this incident: a read-only check first, then the fix. Ask the Telegram bot, or connect an AI agent to the FixLane MCP server and call get_fix_prompt with incident id 1554 and your operating system.