CVE-2024-47252

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Apache Http Server

PublishedJul 10, 2025

First seenJul 10, 2025

Weakness typeCWE-150CWE-150

How to fix

Update

apache http_server2.4.64 or later

Vendor advisories

httpd.apache.org/security/vulnerabilities_24.html

Affected products

Product	Affected versions	Fixed in
apache http_server	2.4.0 ≤ v < 2.4.64	2.4.64

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