high
7.8
CWE
125
Advisory Published
CVE Published
Updated

CVE-2021-1757

First published: Tue Jan 26 2021(Updated: )

An out-of-bounds read was addressed with improved bounds checking. 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 local attacker may be able to elevate their privileges.

Credit: Pan ZhenPeng @Peterpan0927 Alibaba SecurityProteas product-security@apple.com

Affected SoftwareAffected VersionHow to fix
tvOS<14.4
14.4
Apple macOS<11.2
11.2
macOS Catalina
macOS Mojave
Apple iOS, iPadOS, and watchOS<7.3
7.3
Apple iOS and iPadOS<14.4
14.4
Apple iOS, iPadOS, and macOS<14.4
14.4
Apple iOS, iPadOS, and macOS<14.4
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
macOS>=11.0<11.2
tvOS<14.4
Apple iOS, iPadOS, and watchOS<7.3

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 CVE-2021-1757?

    CVE-2021-1757 is a vulnerability in IOSkywalkFamily that allows an out-of-bounds read.

  • Which Apple products are affected by CVE-2021-1757?

    The affected Apple products include macOS Big Sur 11.2, Catalina, Mojave, watchOS up to 7.3, iOS up to 14.4, iPadOS up to 14.4, and tvOS up to 14.4.

  • How severe is CVE-2021-1757?

    The severity of CVE-2021-1757 is dependent on the specific use case and attacker's capabilities.

  • How can I fix CVE-2021-1757?

    To fix CVE-2021-1757, it is recommended to update your Apple devices to the latest available version, which includes the necessary patches.

  • Where can I find more information about CVE-2021-1757?

    You can find more information about CVE-2021-1757 on Apple's official security advisory pages: [link 1](https://support.apple.com/en-us/HT212147), [link 2](https://support.apple.com/en-us/HT212148), and [link 3](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.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203