mod_ssl in Apache 2.0.50 and earlier allows remote attackers to cause a denial of service (CPU consumption) by aborting an SSL connection in a way that causes an Apache child process to enter an infinite loop.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11126
https://exchange.xforce.ibmcloud.com/vulnerabilities/17200
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=130750