What’s Vulnerable › Vulnerabilities

CVE-2019-8834

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-27 · updated 2026-06-17

Description

A configuration issue was addressed with additional restrictions. This issue is fixed in tvOS 13.3, watchOS 6.1.1, iCloud for Windows 10.9, macOS Catalina 10.15.2, Security Update 2019-002 Mojave, and Security Update 2019-007 High Sierra, iOS 13.3 and iPadOS 13.3, iTunes 12.10.3 for Windows, iCloud for Windows 7.16. An attacker in a privileged network position may be able to bypass HSTS for a limited number of specific top-level domains previously not in the HSTS preload list.

Affected products

• Apple iCloud for Windows: before 7.16; from 10.0 before 10.9 — fixed in 10.9, 7.16
• Apple iPadOS: before 13.3 — fixed in 13.3
• Apple Iphone Os: before 13.3 — fixed in 13.3
• Apple iTunes for Windows: before 12.10.3 — fixed in 12.10.3
• macOS: before 10.15.2 — fixed in 10.15.2
• Apple tvOS: before 13.3 — fixed in 13.3
• Apple watchOS: before 6.1.1 — fixed in 6.1.1

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 10.9, 7.16; Apple iPadOS 13.3; Apple Iphone Os 13.3; Apple iTunes for Windows 12.10.3; macOS 10.15.2; Apple tvOS 13.3; Apple watchOS 6.1.1. Check the vendor advisory for mitigations.

References

• https://support.apple.com/en-us/HT210785
• https://support.apple.com/en-us/HT210788
• https://support.apple.com/en-us/HT210789
• https://support.apple.com/en-us/HT210790
• https://support.apple.com/en-us/HT210793
• https://support.apple.com/en-us/HT210794
• https://support.apple.com/en-us/HT210795
• https://support.apple.com/en-us/HT210785
• https://support.apple.com/en-us/HT210788
• https://support.apple.com/en-us/HT210789
• https://support.apple.com/en-us/HT210790
• https://support.apple.com/en-us/HT210793

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