Apple Ecosystem Buffer Overflow (CVE-2025-31277)

Historical catalog analysis: CISA added this entry on March 20, 2026. 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-2025-31277 is a buffer overflow vulnerability (CWE-119) identified across several Apple products. The flaw exists in how these systems process maliciously crafted web content, which could result in memory corruption. This vulnerability was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on March 20, 2026.

Exposure and applicability

The vulnerability affects a broad range of Apple’s ecosystem, specifically impacting Safari and the following operating systems:
* iOS
* iPadOS
* macOS
* watchOS
* tvOS
* visionOS

Exposure occurs when an affected device processes specially crafted web content. Organizations with large fleets of corporate-managed Apple devices or those permitting the use of Safari for business operations are most susceptible to this memory corruption risk.

Remediation priorities

Based on its inclusion in the CISA KEV catalog, remediation should be prioritized for assets that have direct exposure to untrusted web content. Our analysis suggests the following priority sequence:

1. Immediate Patching: Apply vendor-supplied updates according to Apple’s official support documentation. This is the primary method for reducing the attack surface.
2. Asset Identification: Inventory all devices running the affected operating systems to ensure no legacy or unmanaged hardware remains unpatched.
3. Service Decommissioning: If a specific device or version cannot be mitigated via vendor updates, it should be discontinued from use as per CISA’s required action guidance.

How to validate remediation

Verification must go beyond a simple version check. While confirming the installed OS version is a necessary first step, vulnerability management teams should employ the following validation methods:

• Vendor Documentation Alignment: Cross-reference the currently installed build numbers against the specific fixed versions listed in Apple’s support advisories.
• Configuration Audit: For managed devices (MDM), verify that update policies have been successfully pushed and acknowledged by the endpoint, rather than relying on a scheduled update window.

Confirmation of a version update indicates the patch was applied, but it does not inherently guarantee that the memory corruption risk is fully eliminated if other system configurations interfere with the update’s efficacy.

Limits and open questions

There are several unknowns regarding this vulnerability. The source does not specify whether this flaw has been utilized in known ransomware campaigns. Additionally, while CISA has established a remediation deadline of April 3, 2026, for federal agencies, this date is a regulatory requirement for those entities and not a technical expiration of the vulnerability itself.

Residual risk remains for devices that cannot be updated due to hardware age or software incompatibilities. In such cases, the only supported method to eliminate exposure is the discontinuation of the product.

Source and editorial note

CVE-2025-31277: Apple Multiple Products Buffer Overflow Vulnerability · Source date: March 20, 2026 · 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 23, 2026. 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: September 17, 2026 at 00:12 UTC.

Request a Vulnerability Assessment