CVE-2010-1754
Passcode Lock in Apple iOS before 4 on the iPhone and iPod touch does not properly handle alert-based unlocks in conjunction with subsequent Remote Lock operations through MobileMe, which allows physically proximate attackers to bypass intended passcode requirements via unspecified vectors.
Date published : 2010-06-22
http://lists.apple.com/archives/security-announce/2010/Jun/msg00003.html