This indicates an attack attempt against a Denial of Service vulnerability in Apple iPhone OS.
The vulnerability is caused by an error when the vulnerable software handles malformed web pages. It allows a remote attacker to crash vulnerable systems via a crafted web page.
Apple iPhone OS 3.1 on the iPhone 2G and 3.1.3 on the iPhone 3GS
Denial of Service: Remote attackers can crash vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.