By specially crafting HTTP requests, the mod_md challenge handler would dereference a NULL pointer and cause the child process to segfault. This could be used to DoS the server. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.33).
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-8011.json"