CVE-2020-9991 : This issue was addressed with improved checks. This issue is fixed in macOS Big

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.

Published 2020-12-08 22:15:19

Updated 2023-01-09 16:41:59

Source Apple Inc.

View at NVD, CVE.org

Vulnerability category: Denial of service

Products affected by CVE-2020-9991

Apple » Mac Os X
Versions before (<) 11.0.1
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*
Matching versions
Apple » Iphone Os
Versions before (<) 14.0
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
Matching versions
Apple » Watchos
Versions before (<) 7.0
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*
Matching versions
Apple » Icloud » For Windows
Versions from including (>=) 11.0 and before (<) 11.4
cpe:2.3:a:apple:icloud:*:*:*:*:*:windows:*:*
Matching versions
Apple » Icloud » For Windows
Versions before (<) 7.21
cpe:2.3:a:apple:icloud:*:*:*:*:*:windows:*:*
Matching versions
Apple » Tvos
Versions before (<) 14.0
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
Matching versions
Apple » Ipados
Versions before (<) 14.0
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2020-9991

EPSS FAQ

2.34%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 83 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2020-9991

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P	10.0	2.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Partial
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

References for CVE-2020-9991

http://seclists.org/fulldisclosure/2020/Dec/32

Full Disclosure: APPLE-SA-2020-12-14-4 Additional information for APPLE-SA-2020-11-13-1 macOS Big Sur 11.0.1
Mailing List;Third Party Advisory

CVEs referencing this url
https://support.apple.com/en-us/HT211850

About the security content of iOS 14.0 and iPadOS 14.0 - Apple Support
Vendor Advisory

CVEs referencing this url
https://support.apple.com/en-us/HT211844

Vendor Advisory

CVEs referencing this url
https://support.apple.com/en-us/HT211847

Vendor Advisory

CVEs referencing this url
https://lists.apache.org/thread.html/rf9fa47ab66495c78bb4120b0754dd9531ca2ff0430f6685ac9b07772@%3Cdev.mina.apache.org%3E

[jira] [Created] (FTPSERVER-500) Security vulnerability in common/lib/log4j-1.2.17.jar - Pony Mail
Mailing List;Third Party Advisory

CVEs referencing this url
https://support.apple.com/kb/HT211846

About the security content of iCloud for Windows 11.4 - Apple Support
Vendor Advisory
https://support.apple.com/en-us/HT211931

Vendor Advisory

CVEs referencing this url
https://support.apple.com/en-us/HT211843

About the security content of tvOS 14.0 - Apple Support
Vendor Advisory

CVEs referencing this url

Jump to

Vulnerability Details : CVE-2020-9991

Products affected by CVE-2020-9991

Exploit prediction scoring system (EPSS) score for CVE-2020-9991

CVSS scores for CVE-2020-9991

References for CVE-2020-9991