Microsoft Windows Win32k Privilege Escalation Vulnerability

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

Technical Severity

HIGH

7.8 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

91.89 %

Predictive Probability

Percentile Rank

99.7 th

Documented as more likely to be exploited than 99.7% of known CVEs.

Detection Date

Nov 17, 2021

Remediation Due

Dec 01, 2021

CISA Catalog Active

Threat Analysis

Unspecified vulnerability allows for an authenticated user to escalate privileges.

Apply updates per vendor instructions.

Vendor Identity

Microsoft

Affected Product

Windows

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-416

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-40449