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Vulnerability record · CVE-2023-32435 · published 23 June 2023

CVE-2023-32435: Apple WebKit memory corruption allows code execution via web content

Apple · Safari

CVE-2023-32435 is an out-of-bounds write (CWE-787) in Apple's WebKit engine, fixed by improved state management in macOS Ventura 13.3, Safari 16.4, iOS/iPadOS 16.4, and iOS/iPadOS 15.7.7. Processing malicious web content can lead to arbitrary code execution. Apple states it is aware of a report that this issue may have been actively exploited against iOS versions released before iOS 15.7.

8.8 CVSS 3.1 High CISA KEV since 23 Jun 2023 EPSS 23% · top 2.3% CWE-787 · Out-of-bounds write
8.8CVSS 3.1 base score
23%EPSS exploitation probability, 30 days
YesIn CISA KEV, fix deadline passed
4Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

Description

A memory corruption issue was addressed with improved state management. This issue is fixed in macOS Ventura 13.3, Safari 16.4, iOS 16.4 and iPadOS 16.4, iOS 15.7.7 and iPadOS 15.7.7. Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited against versions of iOS released before iOS 15.7.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Automated analysis

Generated by VULONE's analysis model from the NVD record, CISA KEV and EPSS data on 17 September 2026. Confidence: high.

high priorityThe flaw allows remote code execution with no privileges required, is listed in CISA KEV with confirmed in-the-wild exploitation, and has a high EPSS score, though it requires user interaction and patches are available.

What it is

CVE-2023-32435 is an out-of-bounds write (CWE-787) in Apple's WebKit engine, fixed by improved state management in macOS Ventura 13.3, Safari 16.4, iOS/iPadOS 16.4, and iOS/iPadOS 15.7.7. Processing malicious web content can lead to arbitrary code execution. Apple states it is aware of a report that this issue may have been actively exploited against iOS versions released before iOS 15.7.

Impact

An attacker can achieve arbitrary code execution in the context of the affected browser or web-content process, potentially leading to full device compromise. Because the flaw is in WebKit, it affects Safari and any app rendering web content on the listed platforms.

Attack surface

Reached remotely over the network by delivering crafted web content to the victim; the CVSS vector (AV:N/AC:L/PR:N/UI:R) indicates no authentication is required but user interaction (opening or viewing the malicious content) is needed.

Exploitation

Apple reports the issue may have been actively exploited against iOS versions before 15.7, and CISA added it to the KEV catalog on 2023-06-23 with a 2023-07-14 remediation due date. EPSS gives a 30-day exploitation probability of 0.22777 (97.6th percentile).

What to do

  • Apply Apple's updates immediately: macOS Ventura 13.3, Safari 16.4, iOS/iPadOS 16.4, and iOS/iPadOS 15.7.7.
  • Prioritize patching devices still running iOS versions before 15.7, which Apple identified as potentially exploited.
  • Enforce a minimum supported OS and browser version baseline and block or restrict use of unpatched legacy iOS/iPadOS devices on managed networks.
  • Where immediate patching is not possible, reduce exposure by limiting browsing of untrusted web content and applying web content filtering.

Detection

  • Inventory endpoints and confirm OS/browser versions against the fixed releases (macOS 13.3, Safari 16.4, iOS/iPadOS 16.4, iOS/iPadOS 15.7.7).
  • Monitor for crashes or abnormal terminations of Safari, WebKit, or web-content processes on Apple devices, which can accompany memory corruption exploitation.
  • Hunt for unexpected child processes or code execution spawned from Safari/WebKit processes on macOS.
  • Review web proxy and DNS logs for access to suspicious or newly registered domains that could deliver exploit web content.

This assessment is produced automatically and is not human-reviewed. Verify against the vendor advisory before acting on it.

Exploitation in the wild

CISA added CVE-2023-32435 to the Known Exploited Vulnerabilities catalog on 23 June 2023 as "Apple Multiple Products WebKit Memory Corruption Vulnerability". Required action: Apply updates per vendor instructions. Federal deadline 14 July 2023.

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.apple.com/en-us/HT213670 Vendor Advisory
https://support.apple.com/en-us/HT213671 Vendor Advisory
https://support.apple.com/en-us/HT213676 Vendor Advisory
https://support.apple.com/en-us/HT213811 Vendor Advisory
https://support.apple.com/en-us/HT213670 Vendor Advisory
https://support.apple.com/en-us/HT213671 Vendor Advisory
https://support.apple.com/en-us/HT213676 Vendor Advisory
https://support.apple.com/en-us/HT213811 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-32435 US Government Resource

Track CVE-2023-32435 inside VULONE

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-32435), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.