About the security content of watchOS 5.3.7 - Apple Support

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watchOS 5.3.7

Released May 20, 2020

Mail

Available for: Apple Watch Series 1, Apple Watch Series 2, Apple Watch Series 3, and Apple Watch Series 4 when paired to an iPhone with iOS 12 installed

Impact: Processing a maliciously crafted mail message may lead to heap corruption

Description: A memory consumption issue was addressed with improved memory handling.

CVE-2020-9819: ZecOps.com

Wi-Fi

Available for: Apple Watch Series 1, Apple Watch Series 2, Apple Watch Series 3, and Apple Watch Series 4 when paired to an iPhone with iOS 12 installed

Impact: A remote attacker may be able to cause unexpected system termination or corrupt kernel memory

Description: A memory corruption issue was addressed with improved input validation.

CVE-2020-3843: Ian Beer of Google Project Zero