---
cve: "CVE-2025-63807"
severity: "CRITICAL"
cvss: 9.8
epss: "0.5%"
vendor: "n/a"
kev: false
exploited: false
published: "2025-11-20 00:00:00"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-25T12:11:00+01:00"
---

# CVE-2025-63807

> 9.8 CRITICAL · 🧪 PoC

## Beschreibung

An issue was discovered in weijiang1994 university-bbs (aka Blogin) in commit 9e06bab430bfc729f27b4284ba7570db3b11ce84 (2025-01-13). A weak verification code generation mechanism combined with missing rate limiting allows attackers to perform brute-force attacks on verification codes without authentication. Successful exploitation may result in account takeover via password reset or other authentication bypass methods.

## CNA-Record (Kanon, cvelistV5)

- CNA: **mitre**
- State: PUBLISHED
- Stand: 2025-11-21 14:39:39

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **yes**
  - Technical Impact: **total**

## CVSS-Vektor

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

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

## Schwachstellen-Klasse

- **CWE-1390** — Weak Authentication
  The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.
- **CWE-307** — Improper Restriction of Excessive Authentication Attempts
  The product does not implement sufficient measures to prevent multiple failed authentication attempts within a short time frame.

## Referenzen

- <https://gist.github.com/Rycarl-Furry/3e93c6f0d48a29518adf341e0fc7e2dd>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2025-63807/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_