CVE-2025-54813

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Apache Log4cxx

PublishedAug 22, 2025

First seenAug 22, 2025

Weakness typeCWE-117CWE-117

How to fix

Update

apache log4cxx1.5.0 or later

Patches

github.com/apache/logging-log4cxx/pull/512

Vendor advisories

logging.apache.org/security.html#CVE-2025-54813

Affected products

Product	Affected versions	Fixed in
apache log4cxx	v < 1.5.0	1.5.0

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