Improper Log Neutralization in Apache Log4cxx pre-1.5.0
CVE-2025-54813 Published on August 22, 2025

Apache Log4cxx: Improper escaping with JSONLayout
Improper Output Neutralization for Logs vulnerability in Apache Log4cxx. When using JSONLayout, not all payload bytes are properly escaped. If an attacker-supplied message contains certain non-printable characters, these will be passed along in the message and written out as part of the JSON message. This may prevent applications that consume these logs from correctly interpreting the information within them. This issue affects Apache Log4cxx: before 1.5.0. Users are recommended to upgrade to version 1.5.0, which fixes the issue.

Vendor Advisory NVD

Weakness Type

Improper Output Neutralization for Logs

The software does not neutralize or incorrectly neutralizes output that is written to logs.


Affected Versions

Apache Software Foundation Apache Log4cxx:

Exploit Probability

EPSS
0.28%
Percentile
51.69%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.