November 3, 2021 · Applied Cybernetics Group
CVE-2020-9818 — Apple iOS, iPadOS, and watchOS
Apple iOS, iPadOS, and watchOS Out-of-Bounds Write Vulnerability
- Added to KEV
2021-11-03- Federal due date
2022-05-03- Vendor
- Apple
- Product
- iOS, iPadOS, and watchOS
- EPSS
- 75.6th percentile (score 0.009, as of
2026-06-08) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2020-9818
CISA short description
Apple iOS, iPadOS, and watchOS Mail contains an out-of-bounds write vulnerability which may allow memory modification or application termination when processing a maliciously crafted mail message.
Required action
Apply updates per vendor instructions.