Windows 10 V180x: 0Patch fixes IE vulnerability CVE-2021-31959

Windows[German]There are no more security updates for Windows 10 version 1803 and version 1809, as these versions are no longer supported for 30 months. However, ACROS Security released a micro-patch last week to provide a fix for the CVE-2021-31959 vulnerability in the Internet Explorer 11 scripting engine in this Windows 10 version.


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I had mentioned in the blog post Windows 10: Version 1803, 1809 and 1909 has reached end of life that there were last security updates from Microsoft for the following Windows 10 versions as of May 11, 2021.

  • Windows 10 Version 1803 Enterprise and Education
  • Windows 10 Version 1809 Enterprise and Education
  • Windows 10 Version 1909  Home and Pro

However, ACROS Security had promised to provide security fixes for Windows 10 version 1809 after the end of support for this operating system (see 0Patch provides support for Windows 10 version 1809 after EOL). According to the following tweet, ACROS Security is now fulfilling this promise and providing the first micro-patch.

 

The first patch for these systems is for the CVE-2021-31959 vulnerability, a memory corruption in the Scripting Engine of Internet Explorer 11. This vulnerability was closed by Microsoft in June 2021 for Windows systems still in support with a security update. 0Patch now also provides the fix for the Windows 10 variants that have fallen out of support. Microsoft classifies the memory corruption vulnerability in Scripting Engine (CVE-2021-26419) as Exploitation More Likely. The vulnerability was discovered by Ivan Fratric of Google Project Zero. Details can be read in this ACROS Security blog post.

ACROS Security provides micropatches for various out-of-support Windows systems for a small price via its 0patch solution. Notes on how the 0patch agent works, which loads the micropatches into memory at the runtime of an application, can be found in the blog posts (such as here).


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