Exploited vulnerabilities / CVE-2021-30952
Confirmed exploited · remote code execution · Apple Multiple ProductsCVE-2021-30952
Apple Multiple Products remote code execution, confirmed exploited in the wild.
Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.
| CISA's name for it | Apple Multiple Products Integer Overflow or Wraparound Vulnerability |
|---|---|
| Vendor and product | Apple · Multiple Products |
| Type | remote code execution · CWE-190 |
| Exploited | Confirmed by CISA listed 5 March 2026 |
| Likelihood | more likely to be exploited than most |
| Deadline | 26 March 2026 · already passed |
| Used in ransomware | Not reported |
| Advisories | support.apple.com ↗ · support.apple.com ↗ · support.apple.com ↗ · support.apple.com ↗ |
Three steps, in this order
Patch to the fixed version the vendor names, today if the product faces the internet.
Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list.
Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.
| CISA's 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. |
|---|
Know before someone else finds it
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CVE-2021-30952 in short
Is CVE-2021-30952 being exploited?
Yes. CISA added CVE-2021-30952 to its Known Exploited Vulnerabilities catalogue on 5 March 2026, which it does only on evidence of exploitation in the wild.
What is the CISA deadline for CVE-2021-30952?
US federal agencies must remediate it by 26 March 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.
How likely is CVE-2021-30952 to be exploited in the next 30 days?
FIRST's Exploit Prediction Scoring System gives it 7.0%, the 94th percentile of every CVE it scores.
How do I fix CVE-2021-30952?
Patch to the fixed version the vendor names, today if the product faces the internet. Until it is patched, take the affected service off the internet or put it behind a VPN or allow-list. Look for signs it was already used: new accounts, web shells, unexpected processes and outbound connections since the date it was listed.
Other Apple vulnerabilities being exploited
| CVE | Product | Type | Listed |
|---|---|---|---|
| CVE-2024-27834 | Multiple Products | authentication bypass | 4 November 2026 |
| CVE-2026-86950 | Multiple Products | remote code execution | 29 September 2026 |
| CVE-2026-65400 | macOS | authentication bypass | 18 August 2026 |
| CVE-2025-43510 | Multiple Products | exploited vulnerability | 20 March 2026 |
| CVE-2025-43520 | Multiple Products | memory corruption | 20 March 2026 |
| CVE-2025-31277 | Multiple Products | memory corruption | 20 March 2026 |
Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.