Apple has just released iOS 4.3.5 for the iPhone, iPad, and iPod touch.
iOS 4.3.5 Software Update
Fixes a security update with certificate validation.
Products compatible with this software update:
• iPhone 4 (GSM model)
• iPhone 3GS
• iPad 2
• iPad
• iPod touch (4th generation)
• iPod nano (3rd generation)
*Note: Verizon iPhone owners are being updated with iOS 4.2.10.