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HomeCVEsCVE-2021-40444

CVE-2021-40444

Published: January 26, 2026
Last updated:1 day ago (January 26, 2026)
Exploit: YesZero-day: YesPatch: YesTrend: Viral
TL;DR
Updated January 26, 2026

CVE-2021-40444 is a high severity vulnerability with a CVSS score of 8.8. Exploits are available; patches have been released and should be applied urgently. This is classified as a zero-day vulnerability.

Key Points
  • 1High severity (CVSS 8.8/10)
  • 2EPSS: 94.00% - very high likelihood of exploitation
  • 3Public exploits are available
  • 4Vendor patches are available
  • 5Strobes Priority Score: 999/1000 (Critical)
  • 6Affects products from: Microsoft
Severity Scores
CVSS v38.8
CVSS v26.8
Priority Score999.0
EPSS Score94.0
High
Exploitation LikelihoodCritical
94.00%EPSS

Very high probability of exploitation in the next 30 days

Immediate patching required
94.00%
EPSS
8.8
CVSS
Yes
Exploit
Yes
Patch
Critical Priority
high EPSS • exploit exists • high priority

EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.

Description

Microsoft MSHTML contains a unspecified vulnerability that allows for remote code execution.

CVSS v3 Breakdown
Attack Vector:Network
Attack Complexity:Local
Privileges Required:Network
User Interaction:Required
Scope:Changed
Confidentiality:Local
Integrity:High
Availability:Local
Exploit References
Cisa.govPacketstormsecurity.comPacketstormsecurity.comPacketstormsecurity.comMetasploitGitHubGitHubGitHubGitHubGitHub
Patch References
[email protected]Zeroday CZ
Trend Analysis
Viral
Vulnerable Products
VendorProduct
MicrosoftWindows 7
MicrosoftWindows 10 1809
MicrosoftWindows Server 2016
MicrosoftWindows Server 2012
MicrosoftWindows Rt 8.1
MicrosoftWindows 10 1607
MicrosoftWindows Server 2008
MicrosoftWindows Server 2022
MicrosoftWindows 10 2004
MicrosoftWindows 10 21h1

And 7 more...

Advisories
CISA: Microsoft MSHTML contains a unspecified vulnerability that allows for remote code execution.
GitHub AdvisoryNVD
Cite This Page
APA Format
Strobes VI. (2026). CVE-2021-40444 - CVE Details and Analysis. Strobes VI. Retrieved January 27, 2026, from https://vi.strobes.co/cve/CVE-2021-40444
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