Junglewise Threat Intelligence

CVE-2021-34448: Microsoft Windows Scripting Engine Memory Corruption Vulnerability

CVE-2021-34448 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2021-11-03

Technologies: Microsoft Windows, Microsoft Windows 10 Version 1607, Microsoft Windows 10, Microsoft Windows Server 2012 R2, Microsoft Windows Server 2012, Microsoft Windows 8.1, Microsoft Windows Server 2019, Microsoft Windows Server 2016, Microsoft Windows 10 Version 1809, Microsoft Windows Rt 8.1. Vendors: Microsoft.

Executive brief

The Microsoft Windows Scripting Engine contains a memory corruption vulnerability caused by an out-of-bounds write (CWE-787). An attacker could exploit this by convincing a user to visit a specially crafted website or open a malicious file, potentially leading to remote code execution.

Affected products

  • Microsoft Windows 10 up to (excluding) 10.0.10240.19003
  • Microsoft Windows 10 Version 1607 up to (excluding) 10.0.14393.4530
  • Microsoft Windows 10 Version 1809 up to (excluding) 10.0.17763.2061
  • Microsoft Windows 10 Version 1909 up to (excluding) 10.0.18363.1679
  • Microsoft Windows 10 Version 2004 up to (excluding) 10.0.19041.1110
  • Microsoft Windows 10 Version 20H2 up to (excluding) 10.0.19042.1110
  • Microsoft Windows 10 Version 21H1 up to (excluding) 10.0.19043.1110
  • Microsoft Windows 7 Service Pack 1
  • Microsoft Windows 8.1
  • Microsoft Windows RT 8.1
  • Microsoft Windows Server 2008 R2 Service Pack 1
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2016 up to (excluding) 10.0.14393.4530
  • Microsoft Windows Server 2019 up to (excluding) 10.0.17763.2061

Timeline

  • 2021-07-13: disclosed: MSRC Advisory Published
  • 2021-07-22: patched: Initial NIST analysis and patch reference added
  • 2021-11-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2021-11-03: exploited: Confirmed exploited in the wild per CISA KEV catalog and advisory report.

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