This indicates an attack attempt to exploit a Denial of Service vulnerability in NETGEAR ProSafe.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a crafted HTTP request. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
NETGEAR ProSafe GS724Tv3 188.8.131.52 and prior
NETGEAR ProSafe GS716Tv2 184.108.40.206 and prior
NETGEAR ProSafe GS748Tv4 220.127.116.11 and prior
NETGEAR ProSafe GS510TP 18.104.22.168 and prior
Denial of Service: Remote attackers can crash vulnerable systems or services
Currently we are unaware of any vendor supplied patch for this issue.