# CVE-2021-30952

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.

- Page: https://www.vulneraibility.com/cve/CVE-2021-30952
- CVSS: 7.8
- Known exploited: yes, in CISA KEV since 2026-03-05; CISA due date 2026-03-26
- EPSS: 6.96%
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2026-03-05)
- Weakness: CWE-190
- Published: 2021-08-24

## Affected versions

- Apple iOS and iPadOS: affected < 15.2
- Apple macOS: affected < 12.1; < 15.2
- Apple watchOS: affected < 8.3

A version outside these ranges is not a statement that it is unaffected.

## References

- [other] https://support.apple.com/en-us/HT212975
- [other] https://support.apple.com/en-us/HT212976
- [other] https://support.apple.com/en-us/HT212978
- [other] https://support.apple.com/en-us/HT212980
- [other] https://support.apple.com/en-us/HT212982
- [other] http://www.openwall.com/lists/oss-security/2022/01/21/2
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7EQVZ3CEMTINLBZ7PBC7WRXVEVCRHNSM/
- [advisory] https://www.debian.org/security/2022/dsa-5061
- [advisory] https://www.debian.org/security/2022/dsa-5060
- [advisory] https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HQKWD4BXRDD2YGR5AVU7H5J5PIQIEU6V/
- [advisory] https://cloud.google.com/blog/topics/threat-intelligence/coruna-powerful-ios-exploit-kit
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30952

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.