CVE-2021-30952
Apple Multiple Products Integer Overflow or Wraparound Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 26 March 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 6.96% probability · 94th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 5 March 2026 · due 26 March 2026
- Weakness
- CWE-190
- Affected
- apple/safari · apple/ipados · apple/iphone os · apple/macos · apple/tvos · apple/watchos · fedoraproject/fedora · debian/debian linux · webkitgtk/webkitgtk · wpewebkit/wpe webkit
- Source
- product-security@apple.com
EPSS 7.0% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. 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://nvd.nist.gov/vuln/detail/CVE-2021-30952
References
- http://www.openwall.com/lists/oss-security/2022/01/21/2Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/Broken Link
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/Broken Link
- https://support.apple.com/en-us/HT212975Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212976Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212978Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212980Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212982Release Notes, Vendor Advisory
- https://www.debian.org/security/2022/dsa-5060Mailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5061Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2022/01/21/2Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/Broken Link
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/Broken Link
- https://support.apple.com/en-us/HT212975Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212976Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212978Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212980Release Notes, Vendor Advisory
- https://support.apple.com/en-us/HT212982Release Notes, Vendor Advisory
- https://www.debian.org/security/2022/dsa-5060Mailing List, Third Party Advisory
- https://www.debian.org/security/2022/dsa-5061Mailing List, Third Party Advisory
- https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kitExploit, Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.