Historical catalog analysis: CISA added this entry on March 13, 2025. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-24201 is an out-of-bounds write vulnerability (CWE-787) located within the WebKit engine. Specifically, the flaw exists in the HTML parsers used by WebKit to process web content. If successfully exploited via maliciously crafted web content, this vulnerability could allow an attacker to break out of the Web Content sandbox.
Exposure and applicability
This vulnerability affects a broad range of Apple products that rely on WebKit for rendering and processing HTML. This includes:
* Apple OS Ecosystems: iOS, iPadOS, and macOS.
* Browsers: Apple Safari.
* Third-Party Applications: Any non-Apple software or applications that utilize the WebKit engine for HTML processing.
Exposure occurs when a user interacts with crafted web content through an affected browser or application. Because this flaw targets the sandbox boundary, it represents a significant escalation path from initial web rendering to broader system access.
Remediation priorities
Our analysis suggests that remediation should be prioritized based on the exposure of the device to untrusted web content and the criticality of the data residing on the host system.
- Immediate Patching: The primary corrective action is to apply vendor-supplied updates for iOS, iPadOS, and macOS as specified in Apple’s security advisories. This addresses the underlying memory corruption issue in the HTML parser.
- Third-Party Audit: Infrastructure owners should identify non-Apple applications that utilize WebKit. These applications may require separate updates from their respective vendors to ensure the bundled WebKit components are patched.
- Exposure Reduction: Until patching is verified, restricting access to untrusted or unverified web domains on high-value assets could reduce the likelihood of encountering the crafted content required for exploitation.
How to validate remediation
Verification must move beyond simple version checks to ensure the mitigation is active and effective across the environment:
* Version Verification: Confirm that the installed OS and browser versions match or exceed the minimum patched versions listed in Apple’s official support documentation.
* Deployment Audit: For enterprise environments, use mobile device management (MDM) or endpoint management tools to verify that updates have been successfully applied across all managed endpoints, rather than relying on user-reported status.
* Configuration Review: Ensure that the Web Content sandbox is enabled and functioning as intended by the vendor; disabling security features for compatibility may increase residual risk even if a patch is present.
Limits and open questions
Applying the vendor update is intended to mitigate the out-of-bounds write, but it does not guarantee that all potential paths for sandbox escapes are eliminated. Residual risk remains in the form of undiscovered vulnerabilities within the same component or other parts of the WebKit engine.
It remains unknown whether this vulnerability has been leveraged by specific ransomware campaigns. Additionally, while CISA has established a deadline for federal agencies, non-federal organizations must determine their own patching cadence based on their internal risk tolerance and asset criticality.
Source and editorial note
CVE-2025-24201: Apple Multiple Products WebKit Out-of-Bounds Write Vulnerability · Source date: March 13, 2025 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: March 16, 2025. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: October 21, 2026 at 00:52 UTC.
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