Patch Tuesday

The first Windows 11 update reduced Ryzen processor performance by as much as 15 per cent

In total, 66 security flaws have been addressed in this month's security update

Thirteen bugs fixed this month are rated as 'Critical'

Six zero-days have been observed in active attacks

Security update includes patches for Windows, Internet Explorer, Exchange Server, Office, .NET Core, Visual Studio, SharePoint Server, Hyper-V, Skype for Business and Lync

In total, 110 bugs have been fixed

Twelve of them are listed as 'Critical'

Cumulative update issued on Tuesday loads incorrect user profiles and resets desktop and Start menu

Flaw in crypt32.dll file that handles core cryptographic functions in Windows' CryptoAPI so serious users have been urged to patch straightaway

Thirteen vulnerabilities are rated as 'critical'