CVE-2021-1789: Apple Multiple Products Type Confusion Vulnerability

Published Jan 26, 2021
·
Updated

A flaw was found in WebKitGTK.

Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Description: A type confusion issue was addressed with improved state handling.

Reference: https://webkitgtk.org/security/WSA-2021-0002.html

Other sources

A type confusion issue affecting multiple Apple products allows processing of maliciously crafted web content, leading to arbitrary code execution.

— CISA

A type confusion issue was addressed with improved state handling. This issue is fixed in macOS Big Sur 11.2, Security Update 2021-001 Catalina, Security Update 2021-001 Mojave, tvOS 14.4, watchOS 7.3, iOS 14.4 and iPadOS 14.4, Safari 14.0.3. Processing maliciously crafted web content may lead to arbitrary code execution.

— NVD

WebKit. A type confusion issue was addressed with improved state handling.

Credit

@@S0rryMybad(360 Vulcan Team), @@S0rryMybad(360 Vulcan Team), @@S0rryMybad(360 Vulcan Team), @@S0rryMybad(360 Vulcan Team), @@S0rryMybad(360 Vulcan Team)

Affected Software

36 affected componentsFixes available
Apple Multiple Products
Apple tvOS<14.4
14.4
Apple macOS Big Sur<11.2
11.2
Apple Catalina
Apple Mojave
Apple WatchOS<7.3
7.3
Apple Safari<14.0.3
14.0.3
Apple iOS<14.4
14.4
Apple iPadOS<14.4
14.4
Apple iPadOS<14.4
Apple iPhone OS<14.4
Apple iOS and macOS>=10.14<10.14.6
Apple iOS and macOS>=10.15<10.15.7
Apple iOS and macOS=10.14.6
Apple iOS and macOS=10.14.6-security_update_2019-004
Apple iOS and macOS=10.14.6-security_update_2019-005
Apple iOS and macOS=10.14.6-security_update_2019-006
Apple iOS and macOS=10.14.6-security_update_2019-007
Apple iOS and macOS=10.14.6-security_update_2020-001
Apple iOS and macOS=10.14.6-security_update_2020-002
Apple iOS and macOS=10.14.6-security_update_2020-003
Apple iOS and macOS=10.14.6-security_update_2020-004
Apple iOS and macOS=10.14.6-security_update_2020-005
Apple iOS and macOS=10.14.6-security_update_2020-006
Apple iOS and macOS=10.14.6-security_update_2020-007
Apple iOS and macOS=10.14.6-supplemental_update
Apple iOS and macOS=10.14.6-supplemental_update_2
Apple iOS and macOS=10.15.7
Apple iOS and macOS=10.15.7-supplemental_update
Apple macOS>=11.0<11.2
Apple tvOS<14.4
Apple WatchOS<7.3
Fedoraproject Fedora=32
Fedoraproject Fedora=33
WebKitGTK WebKitGTK<2.30.6
redhat/webkitgtk<2.30.6
2.30.6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade tvOS to a version that resolves this vulnerability.

    Fixed in 14.4
  2. Upgrade

    Upgrade Apple macOS to a version that resolves this vulnerability.

    Fixed in 11.2
  3. Upgrade

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

    Fixed in 7.3
  4. Upgrade

    Upgrade Safari to a version that resolves this vulnerability.

    Fixed in 14.0.3
  5. Upgrade

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

    Fixed in 14.4
  6. Upgrade

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

    Fixed in 14.4
  7. Upgrade

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

    Fixed in 2.30.6
  8. Upgrade

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

    Fixed in 11.2
  9. Upgrade

    Upgrade macOS Catalina to a version that resolves this vulnerability.

    Patch Security Update 2021-001 Catalina
  10. Upgrade

    Upgrade macOS Mojave to a version that resolves this vulnerability.

    Patch Security Update 2021-001 Mojave
  11. Upgrade

    Upgrade watchOS to a version that resolves this vulnerability.

    Fixed in 7.3

Event History

Mar 29, 2021
Data Sourced
via Red Hat·06:41 PM
DescriptionSeverityAffected Software
Apr 2, 2021
CVE Published
via MITRE·06:01 PM
Data Sourced
via MITRE·06:01 PM
DescriptionWeakness
Data Sourced
via NVD·06:15 PM
DescriptionSeverityWeaknessAffected Software
May 4, 2022
Known Exploited
via CISA·12:00 AM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the vulnerability ID for this issue?

The vulnerability ID for this issue is CVE-2021-1789.

2

Which Apple products are affected by this vulnerability?

Multiple Apple products including Apple Multiple Products, Safari, macOS Big Sur, Catalina, Mojave, watchOS, iOS, iPadOS, and tvOS are affected.

3

What is the risk of this vulnerability?

The vulnerability allows processing of maliciously crafted web content, leading to arbitrary code execution.

4

How can I fix this vulnerability?

Apply the available security updates or patches provided by Apple for the affected products.

5

Where can I find more information about this vulnerability?

You can find more information about this vulnerability on the following references: [Apple Support - HT212147](https://support.apple.com/en-us/HT212147), [Apple Support - HT212148](https://support.apple.com/en-us/HT212148), [Apple Support - HT212146](https://support.apple.com/en-us/HT212146).

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