CVE-2021-1820: Apple iPadOS

Medium severity, CVSS 6.5. EPSS: 1.3% chance of exploitation in the next 30 days.

A memory initialization issue was addressed with improved memory handling. This issue is fixed in macOS Big Sur 11.3, iOS 14.5 and iPadOS 14.5, watchOS 7.4, tvOS 14.5. Processing maliciously crafted web content may result in the disclosure of process memory.

Affected products

• Apple iPadOS: before 14.5 (fixed in 14.5)
• Apple iPhone OS: before 14.5 (fixed in 14.5)
• Apple macOS: from 11.0, before 11.3 (fixed in 11.3)
• Apple tvOS: before 14.5 (fixed in 14.5)
• Apple watchOS: before 7.4 (fixed in 7.4)

Published 2021-09-08. Last modified 2026-06-17.