Apple Multiple Products Integer Overflow or Wraparound Vulnerability
Apple — watchOS
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.
8.8
7.6%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Published
- Aug 24, 2021
- Modified
- Mar 6, 2026
- Added to KEV
- Mar 5, 2026
- Federal patch due
- Mar 26, 2026
CISA 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.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2021-30952, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2021-30952 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2021-30952?
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.
How severe is CVE-2021-30952?
CVE-2021-30952 has a CVSS base score of 8.8 out of 10 (CVSS 3.1).
Is CVE-2021-30952 actively exploited in the wild?
Yes. CVE-2021-30952 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Mar 5, 2026, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2021-30952?
7.6% - meaning FIRST.org's EPSS model estimates a 7.6% probability this vulnerability will be exploited in the wild within 30 days (94% percentile among all scored CVEs).
What type of vulnerability is CVE-2021-30952?
CVE-2021-30952 is classified under CWE-190 (CWE-190 Integer Overflow or Wraparound).
Cross-checked against
Impactr finds and proves whether CVE-2021-30952 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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