# CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability

> CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2021-30952
Last updated: 2026-06-17T03:51:12Z

- Published: 2021-08-24 18:50 UTC · Updated: 2026-06-17 03:51 UTC · Assigner: apple
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS: 7.0%, 94th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-03-05, federal due date 2026-03-26, ransomware use: Unknown

## 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.

## 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.

## Affected vendors and products

- Apple: iOS and iPadOS
- Apple: macOS
- Apple: watchOS

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2021-30952)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2021-30952)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/)
- [https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/](https://lists.fedoraproject.org/archives/list/package-announce%2540lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/)
- [https://support.apple.com/en-us/HT212975](https://support.apple.com/en-us/HT212975)
- [https://support.apple.com/en-us/HT212976](https://support.apple.com/en-us/HT212976)
- [https://support.apple.com/en-us/HT212978](https://support.apple.com/en-us/HT212978)
- [https://support.apple.com/en-us/HT212980](https://support.apple.com/en-us/HT212980)
- [https://support.apple.com/en-us/HT212982](https://support.apple.com/en-us/HT212982)
- [https://www.debian.org/security/2022/dsa-5060](https://www.debian.org/security/2022/dsa-5060)
- [https://www.debian.org/security/2022/dsa-5061](https://www.debian.org/security/2022/dsa-5061)
- [http://www.openwall.com/lists/oss-security/2022/01/21/2](http://www.openwall.com/lists/oss-security/2022/01/21/2)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2021-30952 · Markdown: https://rewindex.com/cve/CVE-2021-30952.md · JSON: https://rewindex.com/api/v1/cves/CVE-2021-30952 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:19.151Z