CVE-2023-42916

Apple Multiple Products WebKit Out-of-Bounds Read Vulnerability

Medium 6.5
Exploited: added to CISA KEV 4 Dec 2023

Description

An out-of-bounds read was addressed with improved input validation. This issue is fixed in iOS 17.1.2 and iPadOS 17.1.2, macOS Sonoma 14.1.2, Safari 17.1.2. Processing web content may disclose sensitive information. Apple is aware of a report that this issue may have been exploited against versions of iOS before iOS 16.7.1.

Key facts

Published: 30 Nov 2023
Last changed: 21 Oct 2025
Assigned by: apple
KEV added: 4 Dec 2023
KEV fix due: 25 Dec 2023
EPSS: 17.823% likely to be exploited in the next 30 days, higher than 97.216% of CVEs (scores for 15 Nov 2026)
SSVC (CISA): Exploitation: active; Automatable: no; Technical impact: partial

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

6.5CVSS 3.1, Mediumfrom CISA (ADP container)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

What to do

Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

Vendor	Product	Versions
Apple	Safari	unspecified up to but excluding 17.1 (affected)
Apple	macOS	unspecified up to but excluding 14.1 (affected)
Apple	iOS and iPadOS	unspecified up to but excluding 17.1 (affected)