CVE-2021-42279 Chakra Scripting Engine Memory Corruption Vulnerability

What is CVE-2021-42279?

CVE-2021-42279 is a medium-severity memory corruption vulnerability in Microsoft Windows 10, published on 10 Nov 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

Chakra Scripting Engine Memory Corruption Vulnerability

Weakness: CWE-787

Which versions are affected by CVE-2021-42279?

2 open source packages ship an affected version, including Microsoft.ChakraCore. It affects 5 products.

Products include Microsoft Windows 10, Microsoft Windows 11, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022.

How do I fix CVE-2021-42279?

No fix has been published for CVE-2021-42279 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-42279 being exploited?

There is no known exploitation of CVE-2021-42279 in the wild and no public exploit code.

Other vulnerabilities in Microsoft Windows 10

• CVE-2015-2426 Microsoft Windows Adobe Type Manager Library Remote Code Execution Exploited High 8.8
• CVE-2015-1769 Microsoft Windows Mount Manager Privilege Escalation Exploited Medium 6.6
• CVE-2020-1467 Windows Hard Link Elevation of Privilege Vulnerability Critical 10.0
• CVE-2021-26424 Windows TCP/IP Remote Code Execution Vulnerability Critical 9.9
• CVE-2021-28476 Windows Hyper-V Remote Code Execution Vulnerability Critical 9.9

All Microsoft Windows 10 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-jgrp-6qqq-3284.