high
7.8
CWE
416
Advisory Published
CVE Published
Updated

CVE-2021-30683: Use After Free

First published: Mon May 24 2021(Updated: )

A use after free issue was addressed with improved memory management. This issue is fixed in macOS Big Sur 11.4, Security Update 2021-003 Catalina, Security Update 2021-004 Mojave. A malicious application could execute arbitrary code leading to compromise of user information.

Credit: Gabe Kirkpatrick @gabe_k Gabe Kirkpatrick @gabe_k product-security@apple.com Gabe Kirkpatrick @gabe_k

Affected SoftwareAffected VersionHow to fix
Apple macOS<11.4
11.4
macOS Catalina
macOS Mojave
Apple iOS and macOS>=10.14<=10.14.5
Apple iOS and macOS>=10.15<=10.15.6
Apple iOS and macOS=10.14.6
Apple iOS and macOS=10.14.6-security_update_2019-001
Apple iOS and macOS=10.14.6-security_update_2019-002
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-security_update_2021-001
Apple iOS and macOS=10.14.6-security_update_2021-002
Apple iOS and macOS=10.14.6-security_update_2021-003
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-security_update_2020
Apple iOS and macOS=10.15.7-security_update_2020-001
Apple iOS and macOS=10.15.7-security_update_2020-005
Apple iOS and macOS=10.15.7-security_update_2020-007
Apple iOS and macOS=10.15.7-security_update_2021-001
Apple iOS and macOS=10.15.7-security_update_2021-002
Apple iOS and macOS=10.15.7-supplemental_update
Apple iOS and macOS>=11.0<11.4

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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-2021-30683?

    CVE-2021-30683 is a vulnerability in Heimdal that allows for a use-after-free issue due to improper memory management.

  • How does CVE-2021-30683 affect macOS Big Sur?

    macOS Big Sur version 11.4 is affected by CVE-2021-30683 and has been addressed with improved memory management.

  • What other software versions are affected by CVE-2021-30683?

    macOS Mojave and macOS Catalina are also affected by CVE-2021-30683.

  • How severe is CVE-2021-30683?

    CVE-2021-30683 has a Common Vulnerability Scoring System (CVSS) severity rating of moderate.

  • How do I fix CVE-2021-30683?

    To fix CVE-2021-30683, update to the latest version of macOS Big Sur (11.4) or apply the necessary security updates provided by Apple for macOS Mojave and Catalina.

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