Is CISCO ASA webvpn secure?

I'm considering allowing my users remote access to exchange webmail and the intranet via the webvpn feature on the Cisco ASA.  I propose to set up the webvpn to allow http access only, whilst user authentication will be against our AD.

Can anyone advise if there are any pitfalls or security risks to consider in doing this?

Any advice, thoughts, comments most welcome, cheers.
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Cisco ASA Web VPN has known vulnerabilites, which I provided additional links below.

If you are deploying this, then make sure you employ certificates as well as RADIUS authentication for Active Directory.

Depending on the nature of your security requirements, you might want to deploy the Remote access vpn client with RSA SEcure ID

Again, certificates + an AAA server increase your security than out of the box default configurations

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