What’s Vulnerable › Vulnerabilities

CVE-2020-9952

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-16 · updated 2026-06-17
• Weakness: CWE-79

Description

An input validation issue was addressed with improved input validation. This issue is fixed in iOS 14.0 and iPadOS 14.0, tvOS 14.0, watchOS 7.0, Safari 14.0, iCloud for Windows 11.4, iCloud for Windows 7.21. Processing maliciously crafted web content may lead to a cross site scripting attack.

Affected products

• Apple iCloud for Windows: before 7.21; from 11.0 before 11.4 — fixed in 11.4, 7.21
• Apple iPadOS: before 14.0 — fixed in 14.0
• Apple Iphone Os: before 14.0 — fixed in 14.0
• Apple Safari: before 14.0 — fixed in 14.0
• Apple tvOS: before 14.0 — fixed in 14.0
• Apple watchOS: before 7.0 — fixed in 7.0
• Webkitgtk+: through 2.30.3

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 11.4, 7.21; Apple iPadOS 14.0; Apple Iphone Os 14.0; Apple Safari 14.0; Apple tvOS 14.0; Apple watchOS 7.0. Check the vendor advisory for mitigations.

References

• http://seclists.org/fulldisclosure/2020/Nov/18
• http://seclists.org/fulldisclosure/2020/Nov/19
• http://seclists.org/fulldisclosure/2020/Nov/20
• http://seclists.org/fulldisclosure/2020/Nov/22
• http://www.openwall.com/lists/oss-security/2020/11/23/3
• https://security.gentoo.org/glsa/202012-10
• https://support.apple.com/HT211843
• https://support.apple.com/HT211844
• https://support.apple.com/HT211845
• https://support.apple.com/HT211846
• https://support.apple.com/HT211847
• https://support.apple.com/HT211850

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