CVE-2018-4203 — An out-of-bounds read was addressed with improved bounds checking

An out-of-bounds read was addressed with improved bounds checking. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

01What is this vulnerability?

An out-of-bounds read was addressed with improved bounds checking. This issue affected versions prior to iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5.

02Affected products

Vendor	Product	Versions
n	a / iOS, macOS, tvOS, watchOS	Versions prior to: iOS 12, macOS Mojave 10.14, tvOS 12, watchOS 5

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2019-04-03T17:43:12.000Z
• Last modified: 2024-08-05T05:04:29.922Z

09References

• support.apple.com — https://support.apple.com/kb/HT209107
• support.apple.com — https://support.apple.com/kb/HT209193
• support.apple.com — https://support.apple.com/kb/HT209106
• support.apple.com — https://support.apple.com/kb/HT209139
• support.apple.com — https://support.apple.com/kb/HT209108