Names have been changed in the latest version of the VPN software.  The command to deactivate the extension is now as follows:sudo /Applications/Cisco/Cisco\ Secure\ Client\ -\ Socket\ Filter.app/Contents/MacOS/Cisco\ Secure\ Client\ -\ Socket\ Filte...

By the way, this bug persisted through an upgrade to version 5.0.00556 (from 4.x) of the VPN software.

Thank you so much, @akseli uusitalo!  This problem has been plaguing me for months!  Not only does the bug eat up lots of CPU cycles, it also causes certain kinds of operations to fail entirely.  The simplest way to reproduce the problem is to run An...