Microsoft released emergency out‑of‑band patches for Windows 11 and Windows 10 after the January 2026 update caused shutdown hangs and Remote Desktop login failures. The patches revert the problematic code while preserving the security fixes, and are available via Windows Update or manual download, restoring normal shutdown and RDP functionality for most machines within 48 hours.
What Went Wrong
The cumulative security update rolled out on 8 January 2026 (KB5077744 for Windows 11, KB5077797 for Windows 10) introduced two critical defects.
- Shutdown Failure – After applying the update, issuing a shutdown or restart command freezes the UI, leaving the system stuck in a “shutting down” loop and requiring a hard power‑off.
- Remote Desktop Sign‑In Error – Enterprise users receive “0x80004005 – Unspecified error” when connecting via Remote Desktop, caused by a corrupted authentication token generated after the patch.
Both issues appeared across a wide range of hardware, from consumer laptops to enterprise workstations, generating a surge of support tickets.
Microsoft’s Response
Within 24 hours Microsoft issued emergency out‑of‑band (OOB) updates—KB5077850 for Windows 11 and KB5077851 for Windows 10—to revert the faulty code paths while keeping the underlying security improvements. The patches are distributed through Windows Update, the Microsoft Update Catalog, and the Download Center, with an estimated 95 % of affected PCs receiving the fix within two days.
Background on Out‑of‑Band Updates
OOB updates are reserved for critical stability or security issues that require immediate remediation, bypassing the regular monthly release schedule. They have been used sparingly in the past, such as for the “Blue Screen of Death” fix in 2021 and the PrintNightmare emergency patch in 2022.
Implications for Users and Enterprises
Home Users – The shutdown hang can lead to data loss or hardware stress if hard resets become routine. Most consumer PCs automatically applied the OOB fix, restoring normal shutdown behavior within a day.
Enterprises – Remote Desktop is essential for hybrid work. The RDP outage can halt productivity and raise compliance concerns. IT teams should prioritize manual deployment of the OOB patches on critical servers and verify that Group Policy settings for RDP remain intact after the update.
From a security standpoint, the emergency patches retain the original CVE mitigations, ensuring that the previously addressed vulnerabilities are not re‑exposed.
Looking Ahead
Microsoft’s leadership has signaled plans for a refined update pipeline that incorporates more extensive automated testing and staged rollouts based on telemetry from pilot devices. The company also aims to improve communication with enterprise customers by offering early‑access builds for testing critical patches before wide deployment.
Users experiencing shutdown hangs or Remote Desktop login errors should confirm that KB5077850 (Windows 11) or KB5077851 (Windows 10) is installed. For systems that do not receive the OOB patch automatically, a manual download from the Update Catalog and a scheduled restart are recommended.
