CVE-2020-9949

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, iOS 14.0 and iPadOS 14.0, macOS Catalina 10.15.6, Security Update 2020-004 Mojave, Security Update 2020-004 High Sierra, tvOS 14.0. An application may be able to execute arbitrary code with kernel privileges.

• CWE-416

• http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
• https://support.apple.com/en-us/HT211289Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211843Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211844Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211850Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211931Release Notes, Vendor Advisory
• http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
• https://support.apple.com/en-us/HT211289Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211843Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211844Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211850Release Notes, Vendor Advisory
• https://support.apple.com/en-us/HT211931Release Notes, Vendor Advisory

Published

Dec 8, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2020-9943An out-of-bounds read was addressed with improved bounds che…5.5
• CVE-2020-9944An out-of-bounds read was addressed with improved bounds che…5.5
• CVE-2020-9945A spoofing issue existed in the handling of URLs. This issue…4.3
• CVE-2020-9946This issue was addressed with improved checks. This issue is…6.8
• CVE-2020-9947A use after free issue was addressed with improved memory ma…8.8
• CVE-2020-9948A type confusion issue was addressed with improved memory ha…8.8
• CVE-2020-9950A use after free issue was addressed with improved memory ma…8.8
• CVE-2020-9951A use after free issue was addressed with improved memory ma…8.8
• CVE-2020-9952An input validation issue was addressed with improved input …7.1
• CVE-2020-9954A buffer overflow issue was addressed with improved memory h…7.8
• CVE-2020-9955An out-of-bounds write issue was addressed with improved bou…7.8
• CVE-2020-9956An out-of-bounds read was addressed with improved input vali…7.8