Risk Letters

Exploited vulnerability

CVE-2021-40449

TLP:CLEAR

Microsoft Windows Win32k Privilege Escalation Vulnerability

Unspecified vulnerability allows for an authenticated user to escalate privileges.

Facts

  • Vendor: Microsoft
  • Product: Windows
  • CVSS: 7.8
  • EPSS (probability of exploitation within 30 days): 81.9 %
  • On CISA's Known Exploited Vulnerabilities list since: 17 November 2021
  • First known exploitation: 17 November 2021
  • Used in ransomware campaigns (per CISA): Yes
  • CISA's deadline for US federal agencies: 1 December 2021
  • Weakness: CWE-416
  • First seen by Risk Letters: 17 November 2021

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