HHVM < 3.27.4 - Out-of-Bounds Read via Memcache::getextendedstats
The Memcache::getextendedstats function can be used to trigger an out-of-bounds read. Exploiting this issue requires control over memcached server hostnames and/or ports. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).