CVE-2019-8766

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-12-18 · updated 2026-06-17
Weakness: CWE-787

Description

Multiple memory corruption issues were addressed with improved memory handling. This issue is fixed in watchOS 6.1, iCloud for Windows 11.0. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

Apple iCloud for Windows: before 10.8 — fixed in 10.8
Apple watchOS: before 6.1 — fixed in 6.1

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 10.8; Apple watchOS 6.1. Check the vendor advisory for mitigations.

References

https://security.gentoo.org/glsa/202003-22
https://support.apple.com/HT210724
https://support.apple.com/HT210727
https://security.gentoo.org/glsa/202003-22
https://support.apple.com/HT210724
https://support.apple.com/HT210727

Get alerted when CVE-2019-8766 or the next vulnerability affects your stack