CVE-2021-30952

HIGH7.8

CISA KEV

Published 2021-08-24 · Updated 2026-06-17 · Source product-security@apple.com

Summary

CVE-2021-30952 is a high-severity (CVSS 7.8) vulnerability in Apple Multiple Products. CISA added it to the Known Exploited Vulnerabilities catalog on March 5, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by March 26, 2026. CISA does not currently list it as used in ransomware campaigns. Apple has 96 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 96 known-exploited Apple vulnerabilities →

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.

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-190CWE-190

CISA Known-Exploited Vulnerability

Product: Apple — Multiple Products

Name: Apple Multiple Products Integer Overflow or Wraparound Vulnerability

Date added: 2026-03-05 · Due: 2026-03-26

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.

References

View on NVD

More exploited Apple vulnerabilities

Most recently added to CISA KEV

CVE-2024-27834
Multiple Products — Apple Multiple Products Improper Authentication Vulnerability
added 2026-11-04
CVE-2026-86950
Multiple Products — Apple Multiple Products Out-of-Bounds Write Vulnerability
added 2026-09-29
CVE-2026-65400
macOS — Apple macOS Improper Authentication Vulnerability
added 2026-08-18
CVE-2025-43510
Multiple Products — Apple Multiple Products Improper Locking Vulnerability
added 2026-03-20
CVE-2025-43520
Multiple Products — Apple Multiple Products Classic Buffer Overflow Vulnerability
added 2026-03-20
CVE-2025-31277
Multiple Products — Apple Multiple Products Buffer Overflow Vulnerability
added 2026-03-20

View all →

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