# CVE-2021-30900: Apple iOS, iPadOS, and macOS Out-of-Bounds Write Vulnerability

- Exploited (CISA KEV): yes, added 2023-03-30
- Published: 2021-08-24
- CVSS: 7.8 HIGH (v3.1)
- EPSS: 5.2% (92th percentile)
- CWE: CWE-20, CWE-787

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 14.8.1 and iPadOS 14.8.1, iOS 15.1 and iPadOS 15.1. A malicious application may be able to execute arbitrary code with kernel privileges.

## 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-2021-30900 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2021-30900