Description
Insufficient escaping of user-supplied data in mod_ssl in Apache HTTP Server 2.4.63 and earlier allows an untrusted SSL/TLS client to insert escape characters into log files in some configurations. In a logging configuration where CustomLog is used with "%{varname}x" or "%{varname}c" to log variables provided by mod_ssl such as SSL_TLS_SNI, no escaping is performed by either mod_log_config or mod_ssl and unsanitized data provided by the client may appear in log files.
References (4)
Core 4
Core References
Vendor Advisory vendor-advisory
https://httpd.apache.org/security/vulnerabilities_24.html
Scores
CVSS v3
7.5
EPSS
0.0065
EPSS Percentile
71.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
yes
Technical Impact
partial
Details
CWE
CWE-150
Status
published
Products (1)
apache/http_server
2.4.0 - 2.4.64
Published
Jul 10, 2025
Tracked Since
Feb 18, 2026