CVE-2020-9818

Apple iOS, Apple iOS-1, Apple watchOS

Published 9 Jun 2020 · updated 17 Jun 2026 · Analyzed

8.8 High · CVSS 3.1, NVD

Exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, with a remediation deadline of 3 May 2022 for US federal agencies.

Required action: Apply updates per vendor instructions.

Description

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 13.5 and iPadOS 13.5, iOS 12.4.7, watchOS 6.2.5. Processing a maliciously crafted mail message may lead to unexpected memory modification or application termination.

References

support.apple.com/HT211168 · Release Notes, Vendor Advisory
support.apple.com/HT211169 · Release Notes, Vendor Advisory
support.apple.com/HT211175 · Release Notes, Vendor Advisory
www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-9818 · US Government Resource