CVE-2008-4227
Apple iPhone OS 1.0 through 2.1 and iPhone OS for iPod touch 1.1 through 2.1 changes the encryption level of PPTP VPN connections to a lower level than was previously used, which makes it easier for remote attackers to obtain sensitive information or hijack a connection by decrypting network traffic.
Date published : 2008-11-25
http://lists.apple.com/archives/security-announce/2008/Nov/msg00002.html