CVE-2021-30952
Apple Multiple Products Integer Overflow or Wraparound Vulnerability
- High 8.8
- Exploited: added to CISA KEV 5 Mar 2026
Description
An integer overflow was addressed with improved input validation. This issue is fixed in tvOS 15.2, macOS Monterey 12.1, Safari 15.2, iOS 15.2 and iPadOS 15.2, watchOS 8.3. Processing maliciously crafted web content may lead to arbitrary code execution.
Key facts
- Published
- 24 Aug 2021
- Last changed
- 6 Mar 2026
- Assigned by
- apple
- KEV added
- 5 Mar 2026
- KEV fix due
- 26 Mar 2026
- EPSS
- 6.964% likely to be exploited in the next 30 days, higher than 94.225% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
What to do
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Apple | watchOS |
|
| Apple | iOS and iPadOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
| Apple | macOS |
|
Timeline
- 24 Aug 2021 Published
- 5 Mar 2026 CVE-2021-30952 added to CISA KEV
- 5 Mar 2026 Added to the CISA KEV catalogue