PT-2021-4220 · Apple+9 · Ipados+12

Published 2021-01-26 · Updated 2025-10-23 · CVE-2021-1870

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions macOS versions prior to 11.2 Security Update versions prior to 2021-001 Catalina Security Update versions prior to 2021-001 Mojave iOS versions prior to 14.4 iPadOS versions prior to 14.4

Description A logic issue was addressed with improved restrictions, which may allow a remote attacker to cause arbitrary code execution. This issue may have been actively exploited. The vulnerability is related to insufficient input validation in the WebKit module, which is responsible for displaying web pages.

Recommendations For macOS versions prior to 11.2, update to macOS Big Sur 11.2 or later. For Security Update versions prior to 2021-001 Catalina, apply Security Update 2021-001 Catalina or later. For Security Update versions prior to 2021-001 Mojave, apply Security Update 2021-001 Mojave or later. For iOS versions prior to 14.4, update to iOS 14.4 or later. For iPadOS versions prior to 14.4, update to iPadOS 14.4 or later.

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

ALSA-2021:4381

ALSA-2021_4381

ALT-PU-2021-1527

BDU:2021-04824

CESA-2021_4381

CVE-2021-1870

DSA-4877-1

ELSA-2021-4381

MGASA-2021-0181

OPENSUSE-SU-2021:0637-1

OPENSUSE-SU-2021_0637-1

RHSA-2021:4381

RHSA-2021_4381

RHSA-2025:10364

RLSA-2021:4381

RLSA-2021_4381

SUSE-SU-2021:1430-1

SUSE-SU-2021:1499-1

SUSE-SU-2021:1990-1

SUSE-SU-2021_1430-1

SUSE-SU-2021_1499-1

SUSE-SU-2021_1990-1

USN-4894-1

Affected Products

Alt Linux

Almalinux

Astra Linux

Centos

Linuxmint

Apple Macos

Red Hat

Rocky Linux

Suse

Ubuntu

Webkit

Ios

Ipados

References · 178

• https://nvd.nist.gov/vuln/detail/CVE-2021-1870 · Security Note
• https://ubuntu.com/security/CVE-2021-1799 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-1789 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-1801 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU · Vendor Advisory
• https://support.apple.com/en-us/HT212147 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-1765 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2021:0637-1 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/[e-mail]/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ · Vendor Advisory
• https://osv.dev/vulnerability/USN-4894-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-1870 · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2021-4381.html · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2021-4381.html · Vendor Advisory
• https://support.apple.com/en-us/HT212146 · Vendor Advisory
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ · Vendor Advisory