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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.

PUBLISHED Reserved 2025-07-30 | Published 2025-08-22 | Updated 2025-08-22 | Assigner apache




MEDIUM: 6.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N

Problem types

CWE-117 Improper Output Neutralization for Logs

Product status

Default status
unaffected

0.11.0 before 1.5.0
affected

Credits

Sovereign Tech Agency sponsor

References

logging.apache.org/security.html vendor-advisory

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

cve.org (CVE-2025-54813)

nvd.nist.gov (CVE-2025-54813)

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