This indicates an attack attempt against a Denial of Service vulnerability in Cisco Wireless Lan Controller.
The vulnerability is caused by an error when the vulnerable software handles a malicious HTTP GET request. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system.
Cisco Wireless Lan Controller 126.96.36.199
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.