# CVE-2025-54813: log4cxx: Improper Output Neutralization for Logs vulnerability in Apache Log4cxx

CVE-2025-54813 is fixed in log4cxx on 1 platform, first by DEBIAN-CVE-2025-54813, released August 22, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2025-54813
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0135
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | log4cxx Debian 12.15 (bookworm) | 1.0.0-1+deb12u1 | [DEBIAN-CVE-2025-54813](https://patchblox.com/security/data/fix/linux/debian-cve-2025-54813.md) | Aug 22, 2025 |
| Linux | log4cxx Debian 13.5 (trixie) | 1.4.0-1+deb13u1 | [DEBIAN-CVE-2025-54813](https://patchblox.com/security/data/fix/linux/debian-cve-2025-54813.md) | Aug 22, 2025 |
| Linux | log4cxx Debian 14 | 1.4.0-1.1 | [DEBIAN-CVE-2025-54813](https://patchblox.com/security/data/fix/linux/debian-cve-2025-54813.md) | Aug 22, 2025 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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