CVE-2025-54813: log4cxx — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness Type (CWE)

CWE-117 CWE-117

Affected Products

Vendor	Product	Versions
apache	log4cxx	< 1.5.0

References

Advisories & Patches

https://github.com/apache/logging-log4cxx/pull/512 https://logging.apache.org/security.html#CVE-2025-54813

Other References

http://www.openwall.com/lists/oss-security/2025/08/22/3 https://lists.debian.org/debian-lts-announce/2025/10/msg00002.html

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-54813? +

CVE-2025-54813 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-54813? +

CVE-2025-54813 affects products from apache, specifically: log4cxx. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-54813? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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