Microsoft Patch Tuesday, December 2025 Security Update Review

Source: Vulnerabilities and Threat Research – Qualys Security Blog

Author: Diksha Ojha

URL: https://blog.qualys.com/vulnerabilities-threat-research/2025/12/09/microsoft-patch-tuesday-december-2025-security-update-review

ONE SENTENCE SUMMARY:

Microsoft Patch Tuesday December 2025 offers crucial security updates addressing 72 vulnerabilities, including critical zero-day and remote code execution risks.

MAIN POINTS:

  1. December update addresses 72 vulnerabilities, including 3 critical and 55 important-severity ones.
  2. Three zero-day vulnerabilities were fixed; one actively exploited, two publicly disclosed.
  3. Updates include 15 vulnerabilities in Microsoft Edge (Chromium-based).
  4. Patches cover Windows Hyper-V, Windows Defender Firewall Service, and more.
  5. Remote code execution vulnerabilities are deemed critical due to potential exploitation.
  6. Elevation of privilege flaws include use-after-free issues enabling SYSTEM privileges.
  7. CISA flagged CVE-2025-62221 for urgent patching due to active exploitation.
  8. New security prompts in PowerShell address script execution risks.
  9. Critical fixes include vulnerabilities in Microsoft Office and Outlook.
  10. Next Patch Tuesday scheduled for January 13, 2026.

TAKEAWAYS:

  1. Microsoft’s December updates are essential for robust security posture maintenance.
  2. Zero-day vulnerabilities require immediate attention to prevent exploitation.
  3. Elevation of privilege flaws pose significant risks if left unpatched.
  4. Regular updating ensures protection against critical remote code execution threats.
  5. Engage with ongoing webinars for best practices in vulnerability management.