CVE-2021-1788: Use After Free

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 use after free issue was addressed with improved memory management.

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

Other sources

A use after free issue was addressed with improved memory management. 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.

WebKit. A use after free issue was addressed with improved memory management.

Credit

Francisco Alonso@@revskills, Francisco Alonso@@revskills, Francisco Alonso@@revskills, Francisco Alonso@@revskills, Francisco Alonso@@revskills

Affected Software

45 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 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 Safari<14.0.3
Apple tvOS<14.4
Apple WatchOS<7.3
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 tvOS to a version that resolves this vulnerability.

    Fixed in 14.4
  4. Upgrade

    Upgrade Apple macOS to a version that resolves this vulnerability.

    Fixed in 11.2
  5. Upgrade

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

    Fixed in 7.3
  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
  8. Upgrade

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

    Fixed in 14.4
  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 macOS Big Sur to a version that resolves this vulnerability.

    Fixed in 11.2
  12. Upgrade

    Upgrade macOS Catalina and macOS Mojave to a version that resolves this vulnerability.

    Patch Security Update 2021-001
  13. Upgrade

    Upgrade watchOS to a version that resolves this vulnerability.

    Fixed in 7.3
  14. Upgrade

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

    Fixed in 14.4

Event History

Mar 30, 2021
Data Sourced
via Red Hat·08:02 PM
DescriptionSeverityAffected Software
Apr 2, 2021
CVE Published
via MITRE·06:00 PM
Data Sourced
via MITRE·06:00 PM
DescriptionWeakness
Data Sourced
via NVD·06:15 PM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via OSV·06:15 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 the vulnerability ID?

The vulnerability ID is CVE-2021-1788.

2

What is the affected software?

The affected software includes Apple Safari, macOS Big Sur, Catalina, Mojave, watchOS, iOS, iPadOS, and tvOS.

3

What is the severity of CVE-2021-1788?

The severity of CVE-2021-1788 is not specified.

4

How can I fix CVE-2021-1788?

To fix CVE-2021-1788, update to the latest versions of the affected software as recommended by Apple.

5

Where can I find more information about CVE-2021-1788?

You can find more information about CVE-2021-1788 on Apple's official support website.

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