CVE-2020-9991

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

This issue was addressed with improved checks. This issue is fixed in macOS Big Sur 11.0.1, watchOS 7.0, iOS 14.0 and iPadOS 14.0, iCloud for Windows 7.21, tvOS 14.0. A remote attacker may be able to cause a denial of service.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected software

No affected versions have been published.

Timeline

Published: Dec 8, 2020
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2020

CVE-2020-99927.8This issue was addressed by encrypting communications over the network to devices running iOS 14, iPadOS 14, tvOS 14, and watchOS 7. This is CVE-2020-99934.3The issue was addressed with improved UI handling. This issue is fixed in watchOS 7.0, Safari 14.0, iOS 14.0 and iPadOS 14.0. Visiting a mal CVE-2020-99947.1A path handling issue was addressed with improved validation. This issue is fixed in iOS 13.5 and iPadOS 13.5, macOS Catalina 10.15.5, tvOS CVE-2020-99956.1An issue existed in the parsing of URLs. This issue was addressed with improved input validation. This issue is fixed in macOS Server 5.11. CVE-2020-99967.8A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.0.1, iOS 14.0 and iPadOS 14.0.CVE-2020-99975.5An information disclosure issue was addressed with improved state management. This issue is fixed in macOS Catalina 10.15.6, watchOS 6.2.8. CVE-2020-99997.8A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Big Sur 11.0.1, iTunes for Windows 12.1