---
cve: "CVE-2025-30403"
severity: "HIGH"
cvss: 8.1
epss: "29%"
vendor: "Facebook"
kev: false
exploited: false
published: "2025-07-11 19:15:23"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-11T14:06:17+02:00"
---

# CVE-2025-30403

> 8.1 HIGH · 🧪 PoC

## Beschreibung

A heap-buffer-overflow vulnerability is possible in mvfst via a specially crafted message during a QUIC session. This issue affects mvfst versions prior to v2025.07.07.00.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Erforderlich | good |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 65b297332191de6e867c4a3139a233fc84c0e7e0 (Commit)

## Referenzen

- <https://www.facebook.com/security/advisories/cve-2025-30403>
- <https://github.com/facebook/mvfst/commit/65b297332191de6e867c4a3139a233fc84c0e7e0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2025-30403) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_