After releasing the iOS 16.6.1 update on September 7, Apple stopped signature verification for iOS 16.6 today, meaning users who have already upgraded can no longer downgrade.
Apple usually stops signing older versions of iOS when a new version is released to encourage customers to keep the operating system up-to-date, so it’s not uncommon for iOS 16.6 updates to no longer be signed.
Apple focused on fixing two vulnerabilities used by the NSO Group group for its Pegasus monitoring software in its recent iOS 16.6.1 update.
Citizen Lab said in a blog post that the tracking numbers for these two vulnerabilities are CVE-2023-41064 and CVE-2023-41061, and that attackers used the above vulnerabilities to create images containing malicious code and distribute them via PassKit attachments.
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