Microsoft's May 2021 Patch Tuesday Addresses 55 CVEs

On May 11, Microsoft published its monthly security update, known as Patch Tuesday. In this month’s Patch Tuesday release, Microsoft addressed 55 CVEs, including 4 rated critical.

This month’s release contains fixes for a wormable RCE in the HTTP Protocol Stack and multiple vulnerabilities in Microsoft Exchange Server.

This month's Patch Tuesday release includes fixes for:

• .NET Core & Visual Studio
• HTTP.sys
• Internet Explorer
• Microsoft Accessibility Insights for Web
• Microsoft Bluetooth Driver
• Microsoft Dynamics Finance & Operations
• Microsoft Exchange Server
• Microsoft Graphics Component
• Microsoft Office, Microsoft Office Access
• Microsoft Office Excel
• Microsoft Office SharePoint
• Microsoft Office Word
• Microsoft Windows Codecs Library
• Microsoft Windows IrDA
• Open Source Software
• Role: Hyper-V
• Skype for Business and Microsoft Lync
• Visual Studio
• Visual Studio Code
• Windows Container Isolation FS Filter Driver
• Windows Container Manager Service
• Windows Cryptographic Services
• Windows CSC Service
• Windows Desktop Bridge
• Windows OLE
• Windows Projected File System FS Filter
• Windows RDP Client
• Windows SMB, Windows SSDP Service
• Windows WalletService
• Windows Wireless Networking

For more information about the notable vulnerabilities in this month’s Patch Tuesday,, including the availability of patches and Tenable product coverage, please visit our blog.