Microsoft Internet Explorer Use-After-Free Vulnerability

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

Technical Severity

CVSS v3.1 Metrics

HIGH

8.8 / 10

Minimal Risk Critical

Vector Specification

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitation Likelihood

EPSS Prediction

91.99 %

Predictive Probability

Percentile Rank

99.7 th

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

Detection Date

Mar 28, 2022

Remediation Due

Apr 18, 2022

CISA Catalog Active

Threat Analysis

Use-after-free vulnerability in Microsoft Internet Explorer allows remote attackers to execute remote code via a crafted web site that triggers access to a deleted object.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

Microsoft

Affected Product

Internet Explorer

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-416

External Intelligence

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2013-2551