Microsoft Windows Common Log File System (CLFS) Driver 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

20.64 %

Predictive Probability

Percentile Rank

95.4 th

Documented as more likely to be exploited than 95.4% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

Nov 17, 2021

CISA Catalog Active

Threat Analysis

Microsoft Windows Common Log File System (CLFS) driver contains an unspecified vulnerability that allows for privilege escalation.

Apply updates per vendor instructions.

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-36955