CVE-2018-4340: Buffer Overflow

Published Sep 17, 2018
·
Updated

Kernel. A memory corruption issue was addressed with improved memory handling.

Other sources

A memory corruption issue was addressed with improved memory handling. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

Credit

Brandon Azad, Ian Beer(Google Project Zero), Mohamed Ghannam@@_simo36, The UK's National Cyber Security Centre (NCSC), cc(Trend Micro's Zero Day Initiative), Juwei Lin@@panicaII(Trend Micro working with Trend Micro's Zero Day Initiative), cc(Trend Micro), Juwei Lin@@panicaII(Trend Micro working with Trend Micro)

Affected Software

11 affected componentsFixes available
Apple tvOS<12
12
Apple macOS Mojave<10.14.1
10.14.1
Apple High Sierra
Apple Sierra
Apple macOS Mojave<10.14
10.14
Apple WatchOS<5
5
Apple iOS<12
12
Apple iPhone OS<12.0
Apple iOS and macOS<10.14
Apple tvOS<12
Apple WatchOS<5.0

Event History

Apr 3, 2019
CVE Published
via MITRE·05:43 PM
Data Sourced
via MITRE·05:43 PM
DescriptionWeakness

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the vulnerability ID for this issue?

The vulnerability ID for this issue is CVE-2018-4340.

2

What software versions are affected by this vulnerability?

Versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, and watchOS 5 are affected.

3

What is the severity of CVE-2018-4340?

The severity of CVE-2018-4340 is critical with a CVSS score of 7.8.

4

How can I fix this vulnerability?

Update to iOS 12, macOS Mojave 10.14, tvOS 12, or watchOS 5 to fix this vulnerability.

5

Where can I find more information about CVE-2018-4340?

You can find more information about CVE-2018-4340 at the following references: [https://support.apple.com/en-us/HT209193](https://support.apple.com/en-us/HT209193), [https://support.apple.com/kb/HT209106](https://support.apple.com/kb/HT209106), and [https://support.apple.com/kb/HT209107](https://support.apple.com/kb/HT209107).

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.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203