---
title: "CVE-2021-30952: Apple Multiple Products Integer Overflow or Wraparound Vulnerability"
url: https://erroneo.us/security/cve/CVE-2021-30952/
description: "CVE-2021-30952 (Apple Multiple Products): Exploited in the wild (CISA KEV). An integer overflow was addressed with improved input validation. This issue is…"
type: vulnerability-record
section: "Security Digest"
date_published: 2021-08-24
date_modified: 2026-03-06
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2021-30952"
kev: true
cvss: 8.8
epss: 0.06964
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Apple Multiple Products. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-03-05, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-03-26 ; treat that as the outer limit, not the target.
- EPSS 7.0% , percentile 94: FIRST’s model estimates a 7.0% chance of exploitation activity in the next 30 days, higher than 94% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.

## What it is

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.

## Affected products (CVE record)

- Apple watchOS: unspecified < 8.3
- Apple iOS and iPadOS: unspecified < 15.2
- Apple macOS: unspecified < 12.1
- Apple macOS: unspecified < 15.2
- Apple macOS: unspecified < 15.2

## Severity

- CISA-ADP CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2026-03-05; federal due date 2026-03-26. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 6.96% probability of exploitation activity in the next 30 days; percentile 94.

## Sources

- [FEDORA-2022-25a98f5d55](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/)
- [DSA-5061](https://www.debian.org/security/2022/dsa-5061)
- [DSA-5060](https://www.debian.org/security/2022/dsa-5060)
- [FEDORA-2022-f7366e60cb](https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/HT212975)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/HT212976)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/HT212978)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/HT212980)
- [Listed in CISA KEV notes (support.apple.com)](https://support.apple.com/en-us/HT212982)
- [CVE.org record CVE-2021-30952](https://www.cve.org/CVERecord?id=CVE-2021-30952)
- [NVD entry CVE-2021-30952](https://nvd.nist.gov/vuln/detail/CVE-2021-30952)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952)
- [[oss-security] 20220121 WebKitGTK and WPE WebKit Security Advisory WSA-2022-0001](http://www.openwall.com/lists/oss-security/2022/01/21/2)
- [cloud.google.com](https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit)

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Source page: https://erroneo.us/security/cve/CVE-2021-30952/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt