CVE-2021-1844: High severity Apple macOS Big Sur vulnerability

Published Mar 8, 2021
·
Updated

A flaw was found in WebKitGTK.

Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Description: A memory corruption issue was addressed with improved validation.

Reference: https://webkitgtk.org/security/WSA-2021-0003.html

Other sources

A memory corruption issue was addressed with improved validation. This issue is fixed in iOS 14.4.1 and iPadOS 14.4.1, Safari 14.0.3 (v. 14610.4.3.1.7 and 15610.4.3.1.7), watchOS 7.3.2, macOS Big Sur 11.2.3. Processing maliciously crafted web content may lead to arbitrary code execution.

WebKit. A memory corruption issue was addressed with improved validation.

Credit

Clément Lecigne(Google), Alison Huffman(Microsoft Browser Vulnerability Research), Clément Lecigne(Google), Alison Huffman(Microsoft Browser Vulnerability Research), Clément Lecigne(Google), Alison Huffman(Microsoft Browser Vulnerability Research), Clément Lecigne(Google), Alison Huffman(Microsoft Browser Vulnerability Research), Clément Lecigne(Google), Alison Huffman(Microsoft Browser Vulnerability Research)

Affected Software

25 affected componentsFixes available
debian/webkit2gtk
2.36.4-1~deb10u12.38.6-0+deb10u12.40.5-1~deb11u12.42.1-1~deb11u22.40.5-1~deb12u12.42.1-1~deb12u12.42.1-2
debian/wpewebkit
2.38.6-1~deb11u12.38.6-12.42.1-1
Apple macOS Big Sur<11.2.3
11.2.3
Apple tvOS<14.5
14.5
Apple WatchOS<7.3.2
7.3.2
Apple Safari<14.0.3
14.0.3
Apple iOS<14.4.1
14.4.1
Apple iPadOS<14.4.1
14.4.1
Apple Safari<14.0.3
Apple iPadOS<14.4.1
Apple iPhone OS<14.4.1
Apple macOS<11.2.3
Apple tvOS<14.5
Apple WatchOS<7.3.2
Debian Debian Linux=10.0
Fedoraproject Fedora=33
redhat/webkitgtk<2.32.0
2.32.0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0
alpine/webkit2gtk<2.32.0-r0
2.32.0-r0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/webkit2gtk to a version that resolves this vulnerability.

    Fixed in 2.36.4-1~deb10u1Fixed in 2.38.6-0+deb10u1Fixed in 2.40.5-1~deb11u1Fixed in 2.42.1-1~deb11u2Fixed in 2.40.5-1~deb12u1Fixed in 2.42.1-1~deb12u1Fixed in 2.42.1-2
  2. Upgrade

    Upgrade debian/wpewebkit to a version that resolves this vulnerability.

    Fixed in 2.38.6-1~deb11u1Fixed in 2.38.6-1Fixed in 2.42.1-1
  3. Upgrade

    Upgrade Apple macOS to a version that resolves this vulnerability.

    Fixed in 11.2.3
  4. Upgrade

    Upgrade tvOS to a version that resolves this vulnerability.

    Fixed in 14.5
  5. Upgrade

    Upgrade Apple iOS, iPadOS, and watchOS to a version that resolves this vulnerability.

    Fixed in 7.3.2
  6. Upgrade

    Upgrade Safari to a version that resolves this vulnerability.

    Fixed in 14.0.3
  7. Upgrade

    Upgrade Apple iOS and iPadOS to a version that resolves this vulnerability.

    Fixed in 14.4.1
  8. Upgrade

    Upgrade Apple iOS, iPadOS, and macOS to a version that resolves this vulnerability.

    Fixed in 14.4.1
  9. Upgrade

    Upgrade redhat/webkitgtk to a version that resolves this vulnerability.

    Fixed in 2.32.0
  10. Upgrade

    Upgrade alpine/webkit2gtk to a version that resolves this vulnerability.

    Fixed in 2.32.0-r0
  11. Upgrade

    Upgrade iOS/iPadOS to a version that resolves this vulnerability.

    Fixed in 14.4.1
  12. Upgrade

    Upgrade watchOS to a version that resolves this vulnerability.

    Fixed in 7.3.2
  13. Upgrade

    Upgrade macOS Big Sur to a version that resolves this vulnerability.

    Fixed in 11.2.3

Event History

Mar 30, 2021
Data Sourced
via Red Hat·08:05 PM
DescriptionSeverityAffected Software
Apr 2, 2021
CVE Published
via MITRE·06:07 PM
Data Sourced
via MITRE·06:07 PM
DescriptionWeakness
Data Sourced
via NVD·07:15 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·07:15 PM
DescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is CVE-2021-1844?

CVE-2021-1844 is a memory corruption issue in WebKit that has been addressed with improved validation.

2

Which software is affected by CVE-2021-1844?

The following software versions are affected: Apple Safari 14.0.3, Apple iOS up to 14.4.1, Apple iPadOS up to 14.4.1, Apple watchOS up to 7.3.2, Apple macOS Big Sur up to 11.2.3, and Apple tvOS up to 14.5.

3

How can I fix the vulnerability?

To fix the vulnerability, update your software to the following versions: Apple Safari 14.0.3, Apple iOS 14.4.1, Apple iPadOS 14.4.1, Apple watchOS 7.3.2, Apple macOS Big Sur 11.2.3, and Apple tvOS 14.5.

4

Where can I find more information about CVE-2021-1844?

You can find more information about CVE-2021-1844 on the official Apple support page at the following links: [Link-1](https://support.apple.com/en-us/HT212222), [Link-2](https://support.apple.com/en-us/HT212220), [Link-3](https://support.apple.com/en-us/HT212221).

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203