CVE-2020-27917

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.1, iOS 14.2 and iPadOS 14.2, iCloud for Windows 11.5, tvOS 14.2, iTunes 12.11 for Windows. Processing maliciously crafted web content may lead to code execution.

• CWE-416

• http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
• https://support.apple.com/en-us/HT211928Vendor Advisory
• https://support.apple.com/en-us/HT211929Vendor Advisory
• https://support.apple.com/en-us/HT211930Vendor Advisory
• https://support.apple.com/en-us/HT211931Vendor Advisory
• https://support.apple.com/en-us/HT211933Vendor Advisory
• https://support.apple.com/en-us/HT211935Vendor Advisory
• http://seclists.org/fulldisclosure/2020/Dec/32Mailing List, Third Party Advisory
• https://support.apple.com/en-us/HT211928Vendor Advisory
• https://support.apple.com/en-us/HT211929Vendor Advisory
• https://support.apple.com/en-us/HT211930Vendor Advisory
• https://support.apple.com/en-us/HT211931Vendor Advisory
• https://support.apple.com/en-us/HT211933Vendor Advisory
• https://support.apple.com/en-us/HT211935Vendor 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-2020-27910An out-of-bounds read was addressed with improved input vali…7.8
• CVE-2020-27911An integer overflow was addressed through improved input val…7.8
• CVE-2020-27912An out-of-bounds write was addressed with improved input val…7.8
• CVE-2020-27914A memory corruption issue was addressed with improved input …7.8
• CVE-2020-27915A memory corruption issue was addressed with improved input …7.8
• CVE-2020-27916An out-of-bounds write was addressed with improved input val…7.8
• CVE-2020-27918A use after free issue was addressed with improved memory ma…7.8
• CVE-2020-27919An out-of-bounds write was addressed with improved input val…7.8
• CVE-2020-27920A use after free issue was addressed with improved memory ma…8.8
• CVE-2020-27921A race condition was addressed with improved state handling.…7
• CVE-2020-27922A logic issue was addressed with improved state management. …7.8
• CVE-2020-27923An out-of-bounds write was addressed with improved input val…7.8