high
8.8
CWE
119
Advisory Published
CVE Published
Updated

CVE-2018-4121: Buffer Overflow

First published: Thu Mar 29 2018(Updated: )

WebKit. Multiple memory corruption issues were addressed with improved memory handling.

Credit: Yuan Deng Antfound by OSS-Fuzz Jun Kokatsu @shhnjk an anonymous researcher Trend MicroHanming Zhang @4shitak4 Qihoo 360 Vulcan Teamnatashenka Google Project ZeroWanderingGlitch Trend MicroZach Markley likemeng Baidu Security Lab working with Trend MicroOmair Trend Micro product-security@apple.com Natalie Silvanovich Google Project Zero

Affected SoftwareAffected VersionHow to fix
tvOS<11.3
11.3
Apple Mobile Safari<11.1
11.1
Apple iOS, iPadOS, and watchOS<11.3
11.3
Apple iOS, iPadOS, and watchOS<4.3
4.3
Apple iCloud<7.4
7.4
Apple Mobile Safari<11.1
iStyle @cosme iPhone OS<11.3
tvOS<11.3
Apple iOS, iPadOS, and watchOS<4.3
Apple iCloud for Windows<7.4
Microsoft Windows
Apple iTunes for Windows<12.7.4

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-2018-4121?

    CVE-2018-4121 is a vulnerability in certain Apple products that allows for multiple memory corruption issues due to improved memory handling.

  • Which Apple products are affected by CVE-2018-4121?

    The following Apple products are affected by CVE-2018-4121: iOS before 11.3, Safari before 11.1, iCloud before 7.4 on Windows, iTunes before 12.7.4 on Windows, tvOS before 11.3, and watchOS before 4.3.

  • What is the severity of CVE-2018-4121?

    The severity of CVE-2018-4121 is high, with a severity score of 8.8.

  • How can I fix CVE-2018-4121?

    To fix CVE-2018-4121, update to the latest versions of the affected Apple products: iOS 11.3 or later, Safari 11.1 or later, iCloud 7.4 or later on Windows, iTunes 12.7.4 or later on Windows, tvOS 11.3 or later, and watchOS 4.3 or later.

  • Where can I find more information about CVE-2018-4121?

    You can find more information about CVE-2018-4121 on the following references: [SecurityTracker](http://www.securitytracker.com/id/1040604), [GitHub](https://github.com/mwrlabs/CVE-2018-4121), [Gentoo security advisory](https://security.gentoo.org/glsa/201808-04).

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