CVE-2021-30952
Apple watchOS, Apple iOS and iPadOS, Apple macOS
Published 24 Aug 2021 · updated 17 Jun 2026 · Analyzed
7.8 High · CVSS 3.1, NVD
Exploited in the wild
CISA added this to its Known Exploited Vulnerabilities catalog on 5 Mar 2026, with a remediation deadline of 26 Mar 2026 for US federal agencies.
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.
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.
References
- www.openwall.com/lists/oss-security/2022/01/21/2 · Mailing List, Third Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/ · Broken Link
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/ · Broken Link
- support.apple.com/en-us/HT212975 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212976 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212978 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212980 · Release Notes, Vendor Advisory
- support.apple.com/en-us/HT212982 · Release Notes, Vendor Advisory
- www.debian.org/security/2022/dsa-5060 · Mailing List, Third Party Advisory
- www.debian.org/security/2022/dsa-5061 · Mailing List, Third Party Advisory
- cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit · Exploit, Third Party Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952 · US Government Resource