Historical catalog analysis: CISA added this entry on March 05, 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-2021-30952 is an integer overflow or wraparound vulnerability (CWE-190) affecting multiple Apple products, including macOS, iPadOS, Safari, tvOS, and watchOS. The flaw occurs during the processing of maliciously crafted web content. If successfully exploited, this vulnerability could allow an attacker to achieve arbitrary code execution on the affected device.
Exposure and applicability
In a healthcare context, this vulnerability is highly relevant for organizations utilizing Apple hardware for clinical documentation, patient portal access, or administrative tasks. Because the attack vector involves the processing of web content, any device using Safari or integrated web-rendering components to browse the internet or open external links is potentially exposed.
For providers and business associates, the risk centers on the potential for unauthorized code execution on devices that may have access to electronic Protected Health Information (ePHI). If a clinician’s iPad or an administrator’s Mac is compromised via a malicious website, the confidentiality and integrity of the data residing on those endpoints could be jeopardized.
Remediation priorities
Our analysis suggests prioritizing remediation based on the device’s role in handling ePHI and its level of exposure to external web content. We recommend the following actions:
- Inventory and Update: Identify all macOS and iPadOS devices within the clinical and administrative environment. Apply the updates provided by Apple according to their official vendor instructions for this CVE.
- Browser Governance: Ensure that Safari is updated across all platforms, as it is a primary vector for this specific vulnerability.
- Review Web Access Policies: For devices used in high-risk clinical areas, evaluate whether restrictive web filtering could reduce the likelihood of users encountering maliciously crafted content while updates are being deployed.
How to validate remediation
To verify that exposure has been reduced, security leaders and IT teams should employ the following methods:
- Version Verification: Use a mobile device management (MDM) tool or manual system checks to confirm that all Apple devices have been updated to a version where CVE-2021-30952 is addressed.
- Configuration Audit: Confirm that automatic updates are enabled for critical endpoints to reduce the window of exposure for future web-based vulnerabilities.
Note: A version check confirms the presence of a patch but does not guarantee absolute security against all possible exploitation vectors.
Limits and open questions
While CISA has added this vulnerability to the Known Exploited Vulnerabilities catalog, it is currently unknown if this flaw has been utilized in ransomware campaigns. Furthermore, while federal agencies have a specific deadline for remediation (March 26, 2026), this date is a regulatory requirement for those agencies and not a legal mandate for private healthcare providers.
Residual risk remains for devices that cannot be updated due to legacy software dependencies or hardware limitations. In such cases, the only available options are to implement strict network isolation or discontinue use of the affected product.
Source and editorial note
CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability · Source date: March 05, 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 08, 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 16, 2026 at 01:17 UTC.
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