CVE-2025-54812

LOW EPSS 61.0%
Published Aug 22, 202510mo ago · Modified Jun 17, 20262w ago
2.1 CVSS 4.0
Low
Find Similar
Published Aug 22, 2025 10mo ago
Last Modified Jun 17, 2026 2w ago

Description

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.

CVSS Details

Base Score
2.1
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction A
Scope X

Threat Intelligence

EPSS Exploit Probability
61.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-117

Affected Products 1

VendorProductVersionRange
apachelog4cxx* <1.5.0

References 5

  • openwall.com http://www.openwall.com/lists/oss-security/2025/08/22/2
  • github.com https://github.com/apache/logging-log4cxx/pull/509
    Issue TrackingPatch
  • github.com https://github.com/apache/logging-log4cxx/pull/514
    Issue TrackingPatch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/10/msg00002.html
  • logging.apache.org https://logging.apache.org/security.html#CVE-2025-54812
    Vendor Advisory

Remediation

  • github.com https://github.com/apache/logging-log4cxx/pull/509
    Issue TrackingPatch
  • github.com https://github.com/apache/logging-log4cxx/pull/514
    Issue TrackingPatch