Hello Zakameeri,
Looks like you are receiving the intrusion events for this signature.
As a pre-requisite make sure that the device SRU version is anyways updated to the latest.
If you are receiving this Intrusion events , please contact the Sourcefire TAC team for the further investigation. Provide the packet download respective to this Intrusion Event and provide a troubleshoot for the further investigation.
Regards
Jetsy