CVE-2021-1870

9.8 CRITICAL CISA KEV - Actively Exploited
Published: April 02, 2021 Modified: October 23, 2025
View on NVD

Description

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..

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
Source: product-security@apple.com
Broken Link Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
Source: product-security@apple.com
Broken Link Mailing List
https://security.gentoo.org/glsa/202104-03
Source: product-security@apple.com
Third Party Advisory
https://support.apple.com/en-us/HT212146
Source: product-security@apple.com
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212147
Source: product-security@apple.com
Release Notes Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/
Source: af854a3a-2127-422b-91ae-364da2661108
Broken Link Mailing List
https://security.gentoo.org/glsa/202104-03
Source: af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://support.apple.com/en-us/HT212146
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://support.apple.com/en-us/HT212147
Source: af854a3a-2127-422b-91ae-364da2661108
Release Notes Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-1870
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource

11 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
1.2%
78th percentile
Exploitation Status
Actively Exploited
Remediation due: 2021-11-17

Affected Vendors

fedoraproject webkitgtk apple