CVE-2024-47252

HIGH7.5

Apache HTTP Server: mod_ssl error log variable escaping

Published Jul 10, 2025

Modified 4 months ago

Details

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

WEB

http://www.openwall.com/lists/oss-security/2025/07/10/2

WEB

http://www.openwall.com/lists/oss-security/2025/07/10/6

ADVISORY

https://httpd.apache.org/security/vulnerabilities_24.html

WEB

https://lists.debian.org/debian-lts-announce/2025/08/msg00009.html

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2024-47252

CVSS Analysis