Use-After-Free in Safari <16.6 leading to memory corruption (CVE-2023-43000)
CVE-2023-43000 Published on November 5, 2025
A use-after-free issue was addressed with improved memory management. This issue is fixed in macOS Ventura 13.5, iOS 16.6 and iPadOS 16.6, Safari 16.6, iOS 15.8.7 and iPadOS 15.8.7. Processing maliciously crafted web content may lead to memory corruption.
Known Exploited Vulnerability
This Apple Multiple products Use-After-Free Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Apple macOS, iOS, iPadOS, and Safari 16.6 contain a use-after-free vulnerability due to the processing of maliciously crafted web content that may lead to memory corruption.
The following remediation steps are recommended / required by March 26, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vulnerability Analysis
CVE-2023-43000 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be very high.
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2023-43000 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2023-43000
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Affected Versions
Apple macOS:- Version unspecified and below 13.5 is affected.
- Version unspecified and below 16.6 is affected.
- Version unspecified and below 16.6 is affected.
- Version unspecified and below 15.8.7 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.