5.4

CVE-2025-54812

Improper Output Neutralization for Logs vulnerability in Apache Log4cxx.


When using HTMLLayout, logger names are not properly escaped when writing out to the HTML file.
If untrusted data is used to retrieve the name of a logger, an attacker could theoretically inject HTML or Javascript in order to hide information from logs or steal data from the user.
In order to activate this, the following sequence must occur:



  *  Log4cxx is configured to use HTMLLayout.

  *  Logger name comes from an untrusted string

  *  Logger with compromised name logs a message

  *  User opens the generated HTML log file in their browser, leading to potential XSS


Because logger names are generally constant strings, we assess the impact to users as LOW


This issue affects Apache Log4cxx: before 1.5.0.


Users are recommended to upgrade to version 1.5.0, which fixes the issue.

Verknüpft mit AI von unstrukturierten Daten zu bestehenden CPE der NVD
This information is available to logged-in users.
Data is provided by the National Vulnerability Database (NVD)
Apache ≫ Log4cxx Version < 1.5.0
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.19% 0.412
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 5.4 2.3 2.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
security@apache.org 2.1 0 0
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CWE-117 Improper Output Neutralization for Logs

The product does not neutralize or incorrectly neutralizes output that is written to logs.