CVE-2025-54813CWE-117

Apache Log4cxx: Improper escaping with JSONLayout

Medium · published August 22, 2025

CVSS v4.0
6.3
EPSS
1%
Percentile
71.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
EPSS
0.01350 · 71.3th percentile
Weakness
CWE-117 · Improper Output Neutralization for Logs
Published
2025-08-22T18:45Z
EPSS history
Timeline
  • 22 AUG 18:45Z
    Apache Log4cxx: Improper escaping with JSONLayout
    cvelistv5