CVE-2023-32439
Apple Multiple Products WebKit Type Confusion Vulnerability
Apple Multiple Products
A type confusion issue was addressed with improved checks. This issue is fixed in iOS 16.5.1 and iPadOS 16.5.1, iOS 15.7.7 and iPadOS 15.7.7, macOS Ventura 13.4.1, Safari 16.5.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 23 June 2023. US federal agencies were required to remediate it by 14 July 2023.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 24%, which is higher than 97.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2023-32439 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2023-32439.
What does CVE-2023-32439 affect?
CVE-2023-32439 affects Apple Multiple Products. A type confusion issue was addressed with improved checks. This issue is fixed in iOS 16.5.1 and iPadOS 16.5.1, iOS 15.7.7 and iPadOS 15.7.7, macOS Ventura 13.4.1, Safari 16.5.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.
How severe is CVE-2023-32439?
CVE-2023-32439 is rated HIGH with a CVSS base score of 8.8. EPSS puts the probability of exploitation in the next 30 days at 24%, higher than 97.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 14 July 2023.
How should organisations respond to CVE-2023-32439?
Apply the vendor patch for Apple Multiple Products as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.