Microsoft confirms KB5021233 update is causing 0xc000021a errors and blue screens in Windows 10
The curse of the problematic Windows update strikes again! Following the release of the KB5021233 update for Windows 10 last week, Microsoft has acknowledged that the cumulative security update is causing blue screens for some users.
The company is now investigating the cause the issue that leads to a BSoD (Blue Screen of Death) and a 0xc000021a error. The problem affects Windows 10 versions 20H2, 21H1, 21H2 and 22H2, and Microsoft has a workaround for users to try until a fix is developed.
Microsoft releases KB5021233 and KB5021237 updates to fix Windows 10 security issues
Microsoft has released a couple of important cumulative security updates for Windows 10. The KB5021233 and KB5021237 updates are available for Windows 10 versions 1809, 21H1, 21H2 and 22H2.
Because of the security issues addressed by the updates, both are mandatory and will be automatically installed. In addition to security fixes, there are a handful of other notable changes with these updates.