9.8

CVE-2021-1871

Warning

A logic issue was addressed with improved restrictions. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited..

Data is provided by the National Vulnerability Database (NVD)
Apple ≫ iPadOS Version < 14.4
Apple ≫ iPhone OS Version < 14.4
Apple ≫ macOS X Version >= 10.15 < 10.15.7
Apple ≫ macOS X Version10.15.7 Update-
Apple ≫ macOS X Version10.15.7 Updatesecurity_update_2020
Apple ≫ macOS X Version10.15.7 Updatesupplemental_update
Apple ≫ macOS Version >= 11.0.1 < 11.2
Debian ≫ Debian Linux Version10.0
Fedoraproject ≫ Fedora Version33

03.11.2021: CISA Known Exploited Vulnerabilities (KEV) Catalog

Apple iOS, iPadOS, and macOS WebKit Remote Code Execution Vulnerability

Vulnerability

Apple iOS, iPadOS, and macOS WebKit contain an unspecified logic vulnerability that allows a remote attacker to execute code. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.

Description

Apply updates per vendor instructions.

Required actions
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.61% 0.689
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd@nist.gov 7.5 10 6.4
AV:N/AC:L/Au:N/C:P/I:P/A:P
134c704f-9b21-4f2e-91b3-4a467353bcc0 9.8 3.9 5.9
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
https://support.apple.com/en-us/HT212147
Vendor Advisory
Release Notes
https://support.apple.com/en-us/HT212146
Vendor Advisory
Release Notes
https://www.debian.org/security/2021/dsa-4923
Third Party Advisory
Mailing List