Exploited CVEs / Apple / CVE-2021-30952
CVE-2021-30952
Apple Multiple Products Integer Overflow or Wraparound Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-03-26 (that deadline has passed); treat that date as the outer bound for your own environment. The fix is in the vendor advisory: Apple security releases, linked below.
Actively exploited Apple Multiple Products vulnerability, High severity, CVSS 7.8. Added to the CISA KEV catalog 2026-03-05.
Risk summary
Updated July 26, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Senserva AI Opinion for CVE-2021-30952
An integer overflow in Apple's handling of crafted web content, spanning tvOS, macOS, Safari, iPadOS, and watchOS, can lead to arbitrary code execution (CVSS 7.8). What makes it current is the KEV addition on 2026-03-05: confirmation of active exploitation arrived years after the 2021 fix shipped. The exposed population is therefore devices that fell off the update train, including Apple TVs and watches that rarely get management attention.
Do this: Sweep your inventory for Apple devices, including tvOS and watchOS units, still running 2021-era firmware and update or retire them.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2021-30952
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2021-30952
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
CISA required action
Federal (BOD 22-01) remediation due date: 2026-03-26 (past due).
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Official fix for CVE-2021-30952
The authoritative fix and affected-version list are published by the vendor. Find the Multiple Products advisory on Apple security releases.
Common questions about CVE-2021-30952
Is CVE-2021-30952 actively exploited?
Yes. CVE-2021-30952 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-03-05, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 7.6%.
What is the CISA deadline and required action for CVE-2021-30952?
CISA set the federal (BOD 22-01) remediation due date at 2026-03-26, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
What fixes CVE-2021-30952?
The authoritative fix is in the vendor advisory: see Apple security releases for the patched Multiple Products versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2021-30952?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2021-30952's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (5 AM and 3 PM US Central).
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All Apple exploited CVEs on one page: Apple vulnerabilities actively exploited.
Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.
