high
7.5
CWE
416
Advisory Published
CVE Published
Updated

CVE-2021-1764: Use After Free

First published: Tue Jan 26 2021(Updated: )

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, watchOS 7.3, tvOS 14.4, iOS 14.4 and iPadOS 14.4. A remote attacker may be able to cause a denial of service.

Credit: @m00nbsd @m00nbsd @m00nbsd @m00nbsd product-security@apple.com

Affected SoftwareAffected VersionHow to fix
Apple iPadOS<14.4
Apple iPhone OS<14.4
Apple Mac OS X>=10.14<10.14.6
Apple Mac OS X>=10.15<10.15.7
Apple Mac OS X=10.14.6
Apple Mac OS X=10.14.6-security_update_2019-004
Apple Mac OS X=10.14.6-security_update_2019-005
Apple Mac OS X=10.14.6-security_update_2019-006
Apple Mac OS X=10.14.6-security_update_2019-007
Apple Mac OS X=10.14.6-security_update_2020-001
Apple Mac OS X=10.14.6-security_update_2020-002
Apple Mac OS X=10.14.6-security_update_2020-003
Apple Mac OS X=10.14.6-security_update_2020-004
Apple Mac OS X=10.14.6-security_update_2020-005
Apple Mac OS X=10.14.6-security_update_2020-006
Apple Mac OS X=10.14.6-security_update_2020-007
Apple Mac OS X=10.14.6-supplemental_update
Apple Mac OS X=10.14.6-supplemental_update_2
Apple Mac OS X=10.15.7
Apple Mac OS X=10.15.7-supplemental_update
Apple macOS>=11.0<11.2
Apple tvOS<14.4
Apple watchOS<7.3
Apple tvOS<14.4
14.4
Apple watchOS<7.3
7.3
Apple macOS Big Sur<11.2
11.2
Apple Catalina
Apple Mojave
Apple iOS<14.4
14.4
Apple iPadOS<14.4
14.4

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2021-1764?

    CVE-2021-1764 is a vulnerability in the Kernel that allows for a use after free issue.

  • How does CVE-2021-1764 affect macOS Big Sur?

    CVE-2021-1764 affects macOS Big Sur version 11.2.

  • How does CVE-2021-1764 affect Apple watchOS?

    CVE-2021-1764 affects Apple watchOS up to version 7.3.

  • How does CVE-2021-1764 affect Apple iOS?

    CVE-2021-1764 affects Apple iOS up to version 14.4.

  • How does CVE-2021-1764 affect Apple iPadOS?

    CVE-2021-1764 affects Apple iPadOS up to version 14.4.

  • How does CVE-2021-1764 affect Apple tvOS?

    CVE-2021-1764 affects Apple tvOS up to version 14.4.

  • How do I fix CVE-2021-1764?

    To fix CVE-2021-1764, you should update your operating system to the latest version provided by Apple.

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