The Apache HTTP Server version 2.4.27 fixes two vulnerabilities [1].
Airlock WAF is not affected.
Details
CVE-2017-9788: Uninitialized memory reflection in mod_auth_digest. mod_auth_digest is not used by Airlock WAF.
CVE-2017-9789: Read after free in mod_http2.c. Airlock WAF uses a modified version of mod_http2 which is not affected.
No action is required.