VulnerabilityModified

CVE-2025-54813

Improper Output Neutralization for Logs vulnerability in Apache Log4cxx.

MEDIUM 6.3EPSS 1.30%

Does this matter?

Lower severity and a low EPSS score (1.30%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 4.0: 6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 1.30% probability · 69th percentile
CISA KEV: Not listed
Weakness: CWE-117
Affected: apache/log4cxx
Source: security@apache.org

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.