OS SecurityBleeping Computer
4.0 — MEDIUM
August updates trigger 0xc0000409 errors on Windows Server 2016
Microsoft says the August 2026 security update may trigger 0xc0000409 errors on Windows Server 2016 systems where the Compatibility Appraiser diagnostic service is enabled. [...]
🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview
A known issue with Microsoft Compatibility Appraiser in Windows Server 2016 may trigger errors on systems where the Compatibility Appraiser diagnostic service is enabled, potentially causing crashes and application failures.
⚙️Technical Details
Affected Systems
Windows Server 2016
Attack Vectors
Compatibility Appraiser diagnostic service enabled
💥Impact Assessment
Severity: Medium
Who Is at Risk
Users of Windows Server 2016 with Compatibility Appraiser diagnostic service enabled
🛡️Recommended Actions
1Disable the Compatibility Appraiser diagnostic service until a fix is available
2Monitor system logs for recurring Application Error events (Event ID 1000) and exception code 0xc0000409
3Apply the latest Windows security update to mitigate potential risks
📦Affected Products
Windows Server 2016
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