A few days ago, Citrix released the hot fix AG2000_v457 Rev. A. This release fixes a security issue found in all 4.5 releases of the Access Gateway. Fixes for Access Gateway 4.5.5, 4.5.6 and 4.5.7 are available for download.

Especially if you use the SSL VPN feature of the Access Gateway, it is recommended to install this fix as soon as possible.

The download and readme for CAG 4.5.7 Rev. A can be found here: CTX117123, Hot fix AG2000_v457 Rev. A

Regards
Ecki