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COOEY

FAIL › dossier

MSHTML

PRODUCT

· dossier confidence 40%

Microsoft is a public technology giant with a significant security track record, including critical RCE vulnerabilities in MSHTML that were actively exploited by ransomware.

Failure events
2
Zero-days
0
RCEs
2
On KEV
2
Critical
1
Worst shame
95
PROFILE
CategorySoftware VendorWhat they doMicrosoft Corporation develops and supports software, services, devices, and solutions worldwide, including the MSHTML engine.Ownershippublic Websitehttps://www.microsoft.com ↗
SECURITY POSTURE

Microsoft has a history of critical RCE vulnerabilities in MSHTML, including CVE-2021-40444 and CVE-2019-0541, indicating a need for rigorous patch management and input validation controls.

Notable failures
  • CVE-2021-40444 critical RCE in MSHTML
  • CVE-2019-0541 high RCE in MSHTML
  • Active exploitation of MSHTML vulnerabilities by ransomware
Patterns: Remote Code Execution (RCE) in MSHTML engine; Improper input validation in MSHTML
FAILURE HISTORY · 2
DATEEVENTSEVSUMMARY
2021-11-03 CVE-2021-40444 critical A Microsoft MSHTML vulnerability allowed for remote code execution and was actively exploited, potentially linked to ransomware attacks.
2021-11-03 CVE-2019-0541 high Microsoft MSHTML engine had an improper input validation flaw allowing remote code execution via malicious Office documents.
DOSSIER SOURCES
Open questions: Current patch status of MSHTML vulnerabilities · Frequency of MSHTML RCE exploits in 2024-2025
DOSSIER · dex-RAG synthesis · grounded in our own collection + trusted sourcesbuilt 2026-07-31 03:59:56.879450+00:00