Attacks on OWA & Web-app - GET/POST

We are seeing experiencing attacks on OWA and one of our web-apps behind F5 LTM: * Buffer Overflow with OWA /mapi/emsmdb/?MailboxID.... * Arbitrary code with OWA /owa/?ae=PreFormAction&t=IPM....

 

What if anything do you recommend we verify and/or adjust on our F5 for a preventative measure?