What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-03-05
• EPSS: 7.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-24 · updated 2026-06-17
• Weakness: CWE-190

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.

Affected products

• Apple iPadOS: before 15.2 — fixed in 15.2
• Apple Iphone Os: before 15.2 — fixed in 15.2
• Apple macOS: from 12.0 before 12.1 — fixed in 12.1
• Apple Safari: before 15.2 — fixed in 15.2
• Apple tvOS: before 15.2 — fixed in 15.2
• Apple watchOS: before 8.3 — fixed in 8.3
• Debian Linux: 10.0, 11.0
• Fedoraproject Fedora: 34, 35
• Webkit: before 2.34.4 — fixed in 2.34.4
• Wpewebkit Wpe Webkit: before 2.34.4 — fixed in 2.34.4

How to fix

Upgrade to a fixed version: Apple iPadOS 15.2; Apple Iphone Os 15.2; Apple macOS 12.1; Apple Safari 15.2; Apple tvOS 15.2; Apple watchOS 8.3; Webkit 2.34.4; Wpewebkit Wpe Webkit 2.34.4. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2022/01/21/2
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
• https://support.apple.com/en-us/HT212975
• https://support.apple.com/en-us/HT212976
• https://support.apple.com/en-us/HT212978
• https://support.apple.com/en-us/HT212980
• https://support.apple.com/en-us/HT212982
• https://www.debian.org/security/2022/dsa-5060
• https://www.debian.org/security/2022/dsa-5061
• http://www.openwall.com/lists/oss-security/2022/01/21/2
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/

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