Microsoft Windows Remote Code Execution Vulnerability (CVE-2011-3402)
Severity: high · Patch status: unknown · Since 2025-10-06 · CVE-2011-3402
Microsoft Windows Kernel contains an unspecified vulnerability in the TrueType font parsing engine in win32k.sys in the kernel-mode drivers that allows remote attackers to execute arbitrary code via crafted font data in a Word document or web page. CISA added CVE-2011-3402 to its Known Exploited Vulnerabilities catalog on Oct 6, 2025, which means attackers are exploiting it in the wild.
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- US federal agencies must remediate by Oct 27, 2025 (BOD 22-01); treat that as the outer limit.
Sources
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