Back to CVE Browser

CVE-2021-1870

Known Exploited (CISA KEV)CRITICAL

9.8

CVSS Severity Score

EPSS Score86.2470%

EPSS Percentile88.25th

PublishedApr 2, 2021

Last ModifiedOct 23, 2025

Vulnerability 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..

Affected Platforms (CPE)

💻

Apple

Ipados

< 14.4

💻

Apple

Iphone Os

< 14.4

💻

Apple

Mac Os X

>= 10.15 and < 10.15.7

💻

Apple

Mac Os X

= 10.15.7

💻

Apple

Mac Os X

= 10.15.7

💻

Apple

Mac Os X

= 10.15.7

💻

Apple

Macos

>= 11.0.1 and < 11.2

📦

Webkitgtk

Webkitgtk

< 2.30.6

💻

Fedoraproject

Fedora

= 32

💻

Fedoraproject

Fedora

= 33

References & Advisories

🔗 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/

🔗 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/

🔗 https://security.gentoo.org/glsa/202104-03

🔗 https://support.apple.com/en-us/HT212146

🔗 https://support.apple.com/en-us/HT212147

🔗 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JN6ZOD62CTO54CHTMJTHVEF6R2Y532TJ/

🔗 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L3L6ZZOU5JS7E3RFYGLP7UFLXCG7TNLU/

🔗 https://security.gentoo.org/glsa/202104-03

Related Vulnerabilities

CVE-2019-877910.0

A logic issue applied the incorrect restrictions. This issue was addressed by updating the logic to apply the correct restrictions...

CVE-2020-39109.8

A buffer overflow was addressed with improved size validation. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10....

CVE-2020-39099.8

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10....

CVE-2020-39119.8

A buffer overflow was addressed with improved bounds checking. This issue is fixed in iOS 13.4 and iPadOS 13.4, macOS Catalina 10....