CVE-2024-47252: Apache HTTP Server

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Apache HTTP Server: from 2.4.0, before 2.4.64 (fixed in 2.4.64)

Published 2025-07-10. Last modified 2026-06-17.