Vulnerability in Apache Log4cxx
CVE-2025-54813
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.013 (69.2th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 69.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000
Affected products
- Apache Log4cxx
- Apache Software Foundation Log4cxx — versions 0.11.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- logging.apache.org/security.html (vendor-advisory, Vendor Advisory)
- github.com/apache/logging-log4cxx/pull/512 (Patch, patch, Issue Tracking)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-54813?
- CVE-2025-54813 is a high-severity vulnerability in Apache Log4cxx, classified under Improper Output Neutralization for Logs. CVSS score: 7.5/10. Published 2025-08-22.
- How severe is CVE-2025-54813?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-54813 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.