Apache Log4j2 Deserialization of Untrusted Data Vulnerability

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

Technical Severity

CVSS v3.1 Metrics

CRITICAL

9 / 10

Minimal Risk Critical

Vector Specification

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

Exploitation Likelihood

EPSS Prediction

94.34 %

Predictive Probability

Percentile Rank

100.0 th

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

Detection Date

May 01, 2023

Remediation Due

May 22, 2023

CISA Catalog Active

Threat Analysis

Apache Log4j2 contains a deserialization of untrusted data vulnerability due to the incomplete fix of CVE-2021-44228, where the Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.

Remediation Directive

Apply updates per vendor instructions.

Asset Context

Vendor Identity

Apache

Affected Product

Log4j2

Ransomware Status

Campaign Use Known

Weakness Classification

CWE-917

External Intelligence

https://logging.apache.org/log4j/2.x/security.html

NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2021-45046