CVE-2007-1220

The Hypervisor in Microsoft Xbox 360 kernel 4532 and 4548 does not properly verify the parameters passed to the syscall dispatcher, which allows attackers with physical access to bypass code-signing requirements and execute arbitrary code.

CVE-2007-1221

The Hypervisor in Microsoft Xbox 360 kernel 4532 and 4548 allows attackers with physical access to force execution of the hypervisor syscall with a certain register set, which bypasses intended code protection.