CVE-2020-9991

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.

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 2.34% Top 20%

Vendor Advisory apple.com Vendor Advisory apple.com Vendor Advisory apple.com Vendor Advisory apple.com Vendor Advisory apple.com Vendor Advisory apple.com

Affected: Apple tvOS

Affected: Apple watchOS

Affected: Apple iCloud for Windows

Affected: Apple iOS and iPadOS

Affected: Apple macOS

References

Link	Tags
https://support.apple.com/kb/HT211846	vendor advisory
https://support.apple.com/en-us/HT211843	vendor advisory
https://support.apple.com/en-us/HT211850	vendor advisory
https://support.apple.com/en-us/HT211844	vendor advisory
https://support.apple.com/en-us/HT211931	vendor advisory
https://support.apple.com/en-us/HT211847	vendor advisory
http://seclists.org/fulldisclosure/2020/Dec/32	third party advisory mailing list
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772%40%3Cdev.mina.apache.org%3E	mailing list

Frequently Asked Questions

What is the severity of CVE-2020-9991?: CVE-2020-9991 has been scored as a high severity vulnerability.
How to fix CVE-2020-9991?: To fix CVE-2020-9991, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-9991 being actively exploited in the wild?: It is possible that CVE-2020-9991 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2020-9991?: CVE-2020-9991 affects Apple tvOS, Apple watchOS, Apple iCloud for Windows, Apple iOS and iPadOS, Apple macOS, Apple macOS.

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