Microsoft MSHTML Remote Code Execution Vulnerability

Critical Threat Advisory: This vulnerability is documented in active Ransomware campaigns. Immediate remediation required.

Technical Severity

HIGH

8.8 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:L/E:P/RL:O/RC:C

Exploitation Likelihood

94.33 %

Predictive Probability

Percentile Rank

100.0 th

Documented as more likely to be exploited than 100.0% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

Nov 17, 2021

CISA Catalog Active

Threat Analysis

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

Apply updates per vendor instructions.

Vendor Identity

Microsoft

Affected Product

MSHTML

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-22

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-40444