# CVE-2024-4367: Mozilla Firefox

- Exploited (CISA KEV): no
- Published: 2024-05-14
- CVSS: 5.6 MEDIUM (v3.1)
- EPSS: 70.7% (99th percentile)

A type check was missing when handling fonts in PDF.js, which would allow arbitrary JavaScript execution in the PDF.js context. This vulnerability affects Firefox < 126, Firefox ESR < 115.11, and Thunderbird < 115.11.

## 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 | — | — |

## Social

1 posts seen since 2026-11-02.

- Exploit repository (unvetted): https://github.com/minhi1/CVE-2024-4367

"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-2024-4367 · JSON: https://cve.vigilbase.com/api/v1/cves/CVE-2024-4367