A port redirection issue was addressed with additional port validation. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. A malicious website may be able to access restricted ports on arbitrary servers. A port redirection issue was found in WebKitGTK and WPE WebKit in versions prior to 2.30.6. A malicious website may be able to access restricted ports on arbitrary servers. The highest threat from this vulnerability is to data integrity.
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center