CVE-2018-20506: Apple iCloud

High severity, CVSS 8.1. EPSS: 7.6% chance of exploitation in the next 30 days.

SQLite before 3.25.3, when the FTS3 extension is enabled, encounters an integer overflow (and resultant buffer overflow) for FTS3 queries in a "merge" operation that occurs after crafted changes to FTS3 shadow tables, allowing remote attackers to execute arbitrary code by leveraging the ability to run arbitrary SQL statements (such as in certain WebSQL use cases). This is a different vulnerability than CVE-2018-20346.

Affected products

• Apple iCloud: up to and including 7.10
• Apple iPhone OS: before 12.1.3 (fixed in 12.1.3)
• Apple iTunes: up to and including 12.9.3
• Apple Mac OS X: before 10.14.3 (fixed in 10.14.3)
• Apple tvOS: before 12.1.2 (fixed in 12.1.2)
• Apple watchOS: before 5.1.3 (fixed in 5.1.3)
• Opensuse Leap: version 42.3 only
• Sqlite Sqlite: before 3.25.3 (fixed in 3.25.3)

Published 2019-04-03. Last modified 2026-06-17.