CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability

This vulnerability is a buffer overflow weakness in multiple Apple products that can be triggered when the software processes maliciously crafted web content. The result is memory corruption that may be used to interfere with normal program behavior. It matters for organizations that rely on Apple devices or Safari because web content is processed routinely during normal browsing and application activity, exposing endpoints to remote attacks through standard network traffic.

How it works

The flaw belongs to the CWE-119 class of buffer overflow weaknesses. During handling of web content, an internal buffer can receive more data than it was allocated to hold.

An attacker supplies content designed to exceed those limits, which can overwrite adjacent memory locations and produce corruption that affects control flow or data structures.

Am I affected? How to find it in your systems

The affected components are Apple Safari and the operating systems iOS, watchOS, visionOS, iPadOS, macOS, and tvOS. These run on Apple hardware and any endpoints that use Safari for web access.

• Perform an inventory of all Apple devices and any systems with Safari installed.
• Check for the presence of the listed operating systems and browser versions in managed and unmanaged environments.
• Examine configurations that allow processing of external web content, such as browser policies or application integrations.

Confirm exact versions and exposure conditions against the vendor advisory, as applicability depends on the specific product and build.

How to remediate

Apply the vendor-supplied update referenced in the official advisory as the primary remediation step.

After patching, review and enforce standard hardening measures for buffer-handling code paths in web-content processors, including input-size validation and memory-safety controls where supported by the platform.

If you can't patch immediately

Follow the mitigations documented in the vendor advisory. Where those are unavailable, apply CISA guidance including BOD 22-01 requirements for cloud services or discontinue use of the affected product.

• Restrict web traffic from untrusted sources through network segmentation or proxy controls.
• Monitor for unusual memory or process behavior on Apple endpoints using existing endpoint telemetry.
• Disable or limit features that process external web content until updates can be deployed.

If your data may have been exposed

Actively exploited vulnerabilities in this class can lead to breaches that expose credentials or internal resources. Organizations can run a free exposure scan of their email domains to check for presence in known breach data sets.