high
7.6
CWE
362
Advisory Published
Updated

CVE-2021-30857: Race Condition

First published: Tue Aug 24 2021(Updated: )

A race condition was addressed with improved locking. This issue is fixed in Security Update 2021-005 Catalina, iOS 14.8 and iPadOS 14.8, tvOS 15, iOS 15 and iPadOS 15, watchOS 8, macOS Big Sur 11.6. A malicious application may be able to execute arbitrary code with kernel privileges.

Credit: Zweig Kunlun LabManish Bhatt @Meta Red Team XZweig Kunlun LabManish Bhatt @Meta Red Team XZweig Kunlun LabManish Bhatt @Meta Red Team XZweig Kunlun LabManish Bhatt @Meta Red Team XZweig Kunlun LabManish Bhatt @Meta Red Team XZweig Kunlun Lab cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Apple Catalina
Apple watchOS<8
8
Apple iPadOS<15.0
Apple iPhone OS<15.0
Apple Mac OS X<10.15.7
Apple Mac OS X=10.15.7
Apple Mac OS X=10.15.7-security_update_2020-001
Apple Mac OS X=10.15.7-security_update_2021-001
Apple Mac OS X=10.15.7-security_update_2021-002
Apple Mac OS X=10.15.7-security_update_2021-003
Apple Mac OS X=10.15.7-security_update_2021-004
Apple Mac OS X=10.15.7-supplemental_update
Apple macOS>=11.0<11.6
Apple tvOS<15.0
Apple watchOS<8.0
Apple tvOS<15
15
Apple iOS<14.8
14.8
Apple iPadOS<14.8
14.8
Apple iOS<15
15
Apple iPadOS<15
15
Apple macOS<11.6
11.6

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is vulnerability CVE-2021-30857?

    Vulnerability CVE-2021-30857 is a race condition in the kernel that has been addressed with improved locking.

  • Which software versions are affected by CVE-2021-30857?

    CVE-2021-30857 affects Apple watchOS up to version 8, macOS Big Sur up to version 11.6, iOS up to version 15, iPadOS up to version 15, iOS up to version 14.8, iPadOS up to version 14.8, Apple Catalina, and Apple tvOS up to version 15.

  • How severe is vulnerability CVE-2021-30857?

    The severity of vulnerability CVE-2021-30857 is not specified in the provided information.

  • How can I fix vulnerability CVE-2021-30857?

    To fix vulnerability CVE-2021-30857, users should update their affected software to the latest available version provided by Apple.

  • Where can I find more information about vulnerability CVE-2021-30857?

    More information about vulnerability CVE-2021-30857 can be found on the Apple security advisory page: [Apple support page](https://support.apple.com/en-us/HT212814).

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.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203