ThreatCluster

Apache Log4j Vulnerability Exposes Sensitive Log Data to Attackers

First seen 19 Dec 2025, 18:59 UTC • •45

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ThreatCluster •March 12, 2026 at 13:27 UTC

Apache Logging Services has disclosed a critical vulnerability in Log4j Core that allows attackers to intercept sensitive log data. This flaw affects versions 2.0-beta9 through 2.25.2, specifically in the Socket Appender component, which fails to verify TLS, enabling potential man-in-the-middle attacks. Users of the affected versions are urged to update to secure their applications.

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Threat Graph

8 entities, 13 inferred relationships (STIX 2.1).

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Technique (3)

Data Breach
Malware
Man-in-the-Middle

Organization (1)

Apache Logging Services

Affected Platform (3)

Apache
Log4j Core
Socket Appender

Vulnerability (1)

Log4j

Relationships

Log4j targets Apache
Log4j targets Log4j Core
Log4j targets Socket Appender
Data Breach targets Apache
Data Breach targets Log4j Core
Data Breach targets Socket Appender
Malware targets Apache
Malware targets Log4j Core
Malware targets Socket Appender
Man-in-the-Middle targets Apache
Man-in-the-Middle targets Log4j Core
Man-in-the-Middle targets Socket Appender
Log4j related to Apache Logging Services

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