What’s Vulnerable › Vulnerabilities

CVE-2020-9951

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% 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-416

Description

A use after free issue was addressed with improved memory management. This issue is fixed in Safari 14.0. Processing maliciously crafted web content may lead to arbitrary code execution.

Affected products

• Apple iCloud for Windows: before 11.5 — fixed in 11.5
• Apple iPadOS: before 14.0 — fixed in 14.0
• Apple Iphone Os: before 14.0 — fixed in 14.0
• Apple iTunes for Windows: before 12.10.9 — fixed in 12.10.9
• 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
• Debian Linux: 10.0
• Webkitgtk+: through 2.30.3

How to fix

Upgrade to a fixed version: Apple iCloud for Windows 11.5; Apple iPadOS 14.0; Apple Iphone Os 14.0; Apple iTunes for Windows 12.10.9; 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/HT211845
• https://support.apple.com/kb/HT211843
• https://support.apple.com/kb/HT211844
• https://support.apple.com/kb/HT211850
• https://support.apple.com/kb/HT211935
• https://support.apple.com/kb/HT211952

Get alerted when CVE-2020-9951 or the next vulnerability affects your stack