Introduction

The release of Windows 11 cumulative update KB5055523 in April 2025 was intended to enhance system security and performance. However, it has led to a series of significant issues affecting users globally. This article delves into the problems introduced by this update, their implications, and provides guidance on mitigation strategies.

Background on KB5055523

KB5055523 is a cumulative update for Windows 11 version 24H2, released on April 8, 2025. It aimed to address various security vulnerabilities and system improvements. Unfortunately, post-installation reports have highlighted multiple critical issues, including installation failures, system crashes, and application incompatibilities.

Key Issues Identified

Installation Failures

Many users have reported that KB5055523 fails to install, often displaying error codes such as 0x80070306, 0x800f0905, and 0x800704ec. Some installations freeze or get stuck at certain percentages, leading to incomplete updates. (berrall.com)

Windows Hello Malfunctions

Post-update, Windows Hello—a biometric authentication feature—has ceased functioning for some users. This issue is particularly prevalent on devices with specific security features enabled, such as System Guard Secure Launch or Dynamic Root of Trust for Measurement (DRTM). Users encounter messages like "Something happened and your PIN isn't available" or "Sorry something went wrong with face setup." (bleepingcomputer.com)

Blue Screen of Death (BSOD)

The update has caused systems to crash with a BSOD error code 0x18B, indicating a SECUREKERNELERROR. This issue affects devices running Windows 11 version 24H2 and has been acknowledged by Microsoft. (bleepingcomputer.com)

Application Crashes

Certain applications, notably SAP GUI, have experienced crashes post-update. The conflict arises between Windows 11 KB5055523 and security applications like CrowdStrike Falcon Sensor, particularly when the Additional User-Mode Data (AUMD) feature is enabled. (windowslatest.com)

VPN Connectivity Issues

Users have reported VPN connectivity problems after installing KB5055523. While VPN clients establish connections, access to internal servers and applications is disrupted. Uninstalling the update has been reported to resolve these issues. (learn.microsoft.com)

Implications and Impact

The issues stemming from KB5055523 have significant implications:

  • Security Risks: Users may delay or avoid installing critical updates, leaving systems vulnerable to exploits.
  • Operational Disruptions: Organizations relying on Windows Hello for authentication or VPNs for remote work face operational challenges.
  • Productivity Loss: Application crashes and system instability hinder user productivity and can lead to data loss.

Mitigation Strategies

For Installation Failures

  • Use Offline Installers: Download the update from the Microsoft Update Catalog and install it manually.
  • Reset Windows Update Components: Run the following commands in Command Prompt as Administrator:

``INLINECODE0 ``

(answers.microsoft.com)

For Windows Hello Issues

  • Re-enroll Windows Hello: Navigate to Settings > Accounts > Sign-in options > Windows Hello Face and set up facial recognition again.
  • Disable Color Camera: In Device Manager, disable the RGB camera to force Windows Hello to use the infrared sensor. (berrall.com)

For BSOD Errors

  • Apply Known Issue Rollback (KIR): Microsoft has deployed a server-side fix. Ensure your device is connected to the internet and restart to apply the rollback. (bleepingcomputer.com)

For Application Crashes

  • Disable AUMD in CrowdStrike Falcon: Temporarily disable the Additional User-Mode Data feature to prevent conflicts.
  • Uninstall KB5055523: If disabling AUMD is not feasible, uninstall the update until a fix is available. (windowslatest.com)

For VPN Connectivity Issues

  • Uninstall KB5055523: If VPN connectivity is critical, uninstall the update as a temporary measure.
  • Await Vendor Updates: Monitor for patches from Microsoft or VPN client vendors addressing the compatibility issues. (learn.microsoft.com)

Conclusion

The KB5055523 update for Windows 11 has introduced several critical issues affecting system stability and functionality. Users and IT administrators should assess the impact of these issues on their environments and apply the recommended mitigation strategies. Staying informed through official Microsoft channels and community forums is essential for timely updates and solutions.

Reference Links