Zscaler protects against 3 new vulnerabilities for Internet Explorer and Microsoft Windows.

Zscaler, working with Microsoft through their MAPP program, has proactively deployed protection for the following 3 vulnerabilities included in the May 2021 Microsoft security bulletins. Zscaler will continue to monitor exploits associated with all vulnerabilities in the May release and deploy additional protections, as necessary.

CVE-2021-26419 – Scripting Engine Memory Corruption Vulnerability

Severity: Critical

Affected Software

• Internet Explorer 11 on Windows Server 2016
• Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2
• Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2
• Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems
• Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems
• Internet Explorer 11 on Windows Server 2019
• Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems
• Internet Explorer 11 on Windows 10 Version 2004 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 2004 for ARM64-based Systems
• Internet Explorer 11 on Windows 10 Version 2004 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 20H2 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 20H2 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 20H2 for ARM64-based Systems
• Internet Explorer 11 on Windows 10 for 32-bit Systems
• Internet Explorer 11 on Windows 10 for x64-based Systems
• Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems
• Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems
• Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1
• Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1
• Internet Explorer 11 on Windows 8.1 for 32-bit systems
• Internet Explorer 11 on Windows 8.1 for x64-based systems
• Internet Explorer 11 on Windows RT 8.1
• Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Internet Explorer 11 on Windows Server 2012
• Internet Explorer 11 on Windows Server 2012 R2

CVE-2021-31170 – Windows Graphics Component Elevation of Privilege Vulnerability

Severity: Important

Affected Software

• Windows 10 Version 1803 for 32-bit Systems
• Windows 10 Version 1803 for x64-based Systems
• Windows 10 Version 1803 for ARM64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for ARM64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows 10 Version 1909 for 32-bit Systems
• Windows 10 Version 1909 for x64-based Systems
• Windows 10 Version 1909 for ARM64-based Systems
• Windows Server, version 1909 (Server Core installation)
• Windows 10 Version 2004 for 32-bit Systems
• Windows 10 Version 2004 for ARM64-based Systems
• Windows 10 Version 2004 for x64-based Systems
• Windows Server, version 2004 (Server Core installation)
• Windows 10 Version 20H2 for x64-based Systems
• Windows 10 Version 20H2 for 32-bit Systems
• Windows 10 Version 20H2 for ARM64-based Systems
• Windows Server, version 20H2 (Server Core Installation)

CVE-2021-31188 – Windows Graphics Component Elevation of Privilege Vulnerability

Severity: Important

Affected Software

• Windows 10 Version 1803 for 32-bit Systems
• Windows 10 Version 1803 for x64-based Systems
• Windows 10 Version 1803 for ARM64-based Systems
• Windows 10 Version 1809 for 32-bit Systems
• Windows 10 Version 1809 for x64-based Systems
• Windows 10 Version 1809 for ARM64-based Systems
• Windows Server 2019
• Windows Server 2019 (Server Core installation)
• Windows 10 Version 1909 for 32-bit Systems
• Windows 10 Version 1909 for x64-based Systems
• Windows 10 Version 1909 for ARM64-based Systems
• Windows Server, version 1909 (Server Core installation)
• Windows 10 Version 2004 for 32-bit Systems
• Windows 10 Version 2004 for ARM64-based Systems
• Windows 10 Version 2004 for x64-based Systems
• Windows Server, version 2004 (Server Core installation)
• Windows 10 Version 20H2 for x64-based Systems
• Windows 10 Version 20H2 for 32-bit Systems
• Windows 10 Version 20H2 for ARM64-based Systems
• Windows Server, version 20H2 (Server Core Installation)
• Windows 10 for 32-bit Systems
• Windows 10 for x64-based Systems
• Windows 10 Version 1607 for 32-bit Systems
• Windows 10 Version 1607 for x64-based Systems
• Windows Server 2016
• Windows Server 2016 (Server Core installation)
• Windows 7 for 32-bit Systems Service Pack 1
• Windows 7 for x64-based Systems Service Pack 1
• Windows 8.1 for 32-bit systems
• Windows 8.1 for x64-based systems
• Windows RT 8.1
• Windows Server 2008 for 32-bit Systems Service Pack 2
• Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 for x64-based Systems Service Pack 2
• Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
• Windows Server 2008 R2 for x64-based Systems Service Pack 1
• Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
• Windows Server 2012
• Windows Server 2012 (Server Core installation)
• Windows Server 2012 R2
• Windows Server 2012 R2 (Server Core installation)