Risk Letters

Exploited vulnerability

CVE-2011-3402

TLP:CLEAR

Microsoft Windows Remote Code Execution Vulnerability

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.

Facts

  • Vendor: Microsoft
  • Product: Windows
  • CVSS: 8.8
  • EPSS (probability of exploitation within 30 days): 78.1 %
  • On CISA's Known Exploited Vulnerabilities list since: 6 October 2025
  • First known exploitation: 6 October 2025
  • CISA's deadline for US federal agencies: 27 October 2025
  • First seen by Risk Letters: 6 October 2025

Members see which Nordic sectors the flaw hits, and what to do about it.

Get the full brief

Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD