CVE-2021-30952
KEVApple Multiple Products Integer Overflow or Wraparound Vulnerability
Description
Apple tvOS, macOS, Safari, iPadOS and watchOS contain an integer overflow or wraparound vulnerability due to the processing of maliciously crafted web content that may lead to arbitrary code execution.
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 3.1 vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HPublishedAug 24, 2021
Last modifiedJun 17, 2026
Added to KEVMar 5, 2026
Remediation dueMar 26, 2026
References
- openwall.com/lists/oss-security/2022/01/21/2Mailing ListThird 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/HT212975Release NotesVendor Advisory
- support.apple.com/en-us/HT212976Release NotesVendor Advisory
- support.apple.com/en-us/HT212978Release NotesVendor Advisory
- support.apple.com/en-us/HT212980Release NotesVendor Advisory
- support.apple.com/en-us/HT212982Release NotesVendor Advisory
- debian.org/security/2022/dsa-5060Mailing ListThird Party Advisory
- debian.org/security/2022/dsa-5061Mailing ListThird Party Advisory
- cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kitExploitThird Party Advisory
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952US Government Resource
0 recent articles mention this CVE
70
Risk assessment · High
Actively exploited. Patch immediately.
- Exploitation
- Confirmed in the wild (CISA KEV)
- Federal remediation deadline
- Overdue by 215 days
- CVSS
- 7.8 HIGH
- EPSS (30-day exploit probability)
- 7.0% · top 6% of all CVEs
- Weakness
- CWE-190
Recommended actions
- 1.Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- 2.Treat as emergency change: patch or isolate internet-facing instances first.
- 3.Hunt for compromise: review logs for the disclosure window, not just from the patch date.
Assessment is derived automatically from the live signals above; verify against your own asset inventory.