# CVE-2021-30663: Apple Multiple Products WebKit Integer Overflow Vulnerability

- Exploited (CISA KEV): yes, added 2021-11-03
- Published: 2021-09-08
- CVSS: 7.8 HIGH (v3.1)
- EPSS: 3.5% (89th percentile)
- CWE: CWE-20, CWE-190

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.

## Edge WAF coverage (claimed by vendors, not measured)

| Vendor | Status | First rule | Days after publication |
|---|---|---|---|
| Cloudflare | Before feed history | — | — |
| AWS | No public claim | — | — |
| Microsoft Azure | No public claim | — | — |
| Google Cloud | Before feed history | — | — |
| Fastly | Before feed history | — | — |
| F5 | Before feed history | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | Before feed history | — | — |

"No public claim" means no vendor statement names this CVE; "Before feed history" means the CVE is older than the vendor feed. In both cases generic rules may still block it.

HTML: https://cve.vigilbase.com/cve/CVE-2021-30663 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2021-30663