IIS 10.0 Critical Security Update — Patch Immediately

Microsoft releases an emergency security patch for IIS 10.0 addressing CVE-2025-XXXX — a critical remote code execution vulnerability affecting all Windows Server versions running IIS.

Affected Versions

• Windows Server 2019 — IIS 10.0
• Windows Server 2022 — IIS 10.0
• Windows Server 2025 — IIS 10.0

Apply the Patch Immediately

# Via Windows Update (recommended)
Install-WindowsUpdate -AcceptAll -AutoReboot

# Or via PowerShell with WSUS
wuauclt /detectnow /updatenow

# Verify patch is applied
Get-HotFix | Where-Object {$_.HotFixID -eq "KB5012345"}

Temporary Mitigation if Patching is Delayed

# Disable the vulnerable IIS module temporarily
# In IIS Manager → Modules → disable [affected module]

# Or via command line
%windir%\system32\inetsrvppcmd.exe set config -section:system.webServer/globalModules /-"[name='VulnerableModule']"

Verify IIS is Running Latest Version

# Check IIS version
(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\InetStp").setupstring

# Check running version
Get-Process w3wp | Select-Object -Property *

Conclusion

Critical IIS patches should be applied within 24 hours. Our team provides emergency patch management for Windows and Linux servers.