# CVE-2023-4863: Google Chromium WebP Heap-Based Buffer Overflow Vulnerability

- Exploited (CISA KEV): yes, added 2023-09-13
- Published: 2023-09-12
- CVSS: 8.8 HIGH (v3.1)
- EPSS: 100.0% (100th percentile)
- CWE: CWE-787

Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: Critical)

## 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 | No public claim | — | — |
| Akamai | No public source | — | — |
| OWASP CRS | No public claim | — | — |

"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-2023-4863 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2023-4863