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 modssl such as SSLTLSSNI, no escaping is performed by either modlogconfig or modssl and unsanitized data provided by the client may appear in log files.