Microsoft Windows Privilege Escalation Vulnerability

Technical Severity

CVSS v3.1 Metrics

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:U/RL:O/RC:C

Exploitation Likelihood

EPSS Prediction

8.43 %

Predictive Probability

Percentile Rank

92.1 th

Documented as more likely to be exploited than 92.1% of known CVEs.

Detection Date

Oct 06, 2025

Remediation Due

Oct 27, 2025

CISA Catalog Active

Threat Analysis

Microsoft Windows Common Log File System Driver contains a privilege escalation vulnerability that could allow a local, privileged attacker to bypass certain security mechanisms.

Remediation Directive

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

External Intelligence

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43226

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-43226