System termination via WebContentFilter out-of-bounds write
Published Jul 29, 2025 · Updated Apr 2, 2026
An out-of-bounds write in Apple macOS Sequoia before 15.6 allows attackers to trigger unexpected system termination through an app. The WebContentFilter component writes beyond a buffer boundary because affected code lacks adequate bounds checking; Apple has not disclosed the specific function or input. Execution of an app on an affected Mac is required, and the documented consequence is a system crash rather than data access or code execution.
Summary
What happened
An out-of-bounds write in Apple macOS Sequoia before 15.6 allows attackers to trigger unexpected system termination through an app. The WebContentFilter component writes beyond a buffer boundary because affected code lacks adequate bounds checking; Apple has not disclosed the specific function or input. Execution of an app on an affected Mac is required, and the documented consequence is a system crash rather than data access or code execution.
The record
- CVE
- CVE-2025-43237
- Published
- Jul 29, 2025
- Updated
- Apr 2, 2026
- Vendor
- Apple
- Product
- macOS
- Classifications
- CWE-787, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 29, 2025CVE publishedPublication date reported by the CVE source.
- Apr 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <15.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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