# CVE-2021-30663

An integer overflow was addressed with improved input validation. This issue is fixed in iOS 14.5.1 and iPadOS 14.5.1, tvOS 14.6, iOS 12.5.3, Safari 14.1.1, macOS Big Sur 11.3.1. Processing maliciously crafted web content may lead to arbitrary code execution.

- Page: https://www.vulneraibility.com/cve/CVE-2021-30663
- CVSS: 8.8
- Known exploited: yes, in CISA KEV since 2021-11-03; CISA due date 2021-11-17
- EPSS: 3.52% (percentile 89.4)
- CISA SSVC: exploitation active, automatable no, technical impact total (assessed 2025-02-04)
- Weakness: CWE-190
- Published: 2021-09-08

## Affected versions

- Apple macOS: affected < 11.3; < 14.5; < 12.5; < 14.6; < 14.1

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

## References

- [other] https://support.apple.com/en-us/HT212532
- [other] https://support.apple.com/en-us/HT212534
- [other] https://support.apple.com/en-us/HT212341
- [other] https://support.apple.com/en-us/HT212335
- [other] https://support.apple.com/en-us/HT212336
- [other] https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-30663

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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.