---
cve: "CVE-2021-45039"
severity: "CRITICAL"
cvss: 9.8
epss: "4.2%"
vendor: "n/a"
kev: false
exploited: false
published: "2023-05-31 20:15:10"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-23T17:17:18+02:00"
---

# CVE-2021-45039

> 9.8 CRITICAL

## Beschreibung

Multiple models of the Uniview IP Camera (e.g., IPC_G6103 B6103.16.10.B25.201218, IPC_G61, IPC21, IPC23, IPC32, IPC36, IPC62, and IPC_HCMN) offer an undocumented UDP service on port 7788 that allows a remote unauthenticated attacker to overflow an internal buffer and achieve code execution. By using this buffer overflow, a remote attacker can start the telnetd service. This service has a hardcoded default username and password (root/123456). Although it has a restrictive shell, this can be easily bypassed via the built-in ECHO shell command.

## CNA-Record (Kanon, cvelistV5)

- CNA: **mitre**
- State: PUBLISHED
- Stand: 2025-01-10 16:32:47

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **poc**
  - 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-120** — Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer.

## Angriffsmuster (CAPEC)

- [CAPEC-10 — Buffer Overflow via Environment Variables](https://capec.mitre.org/data/definitions/10.html) _(Severity: High)_
- [CAPEC-14 — Client-side Injection-induced Buffer Overflow](https://capec.mitre.org/data/definitions/14.html) _(Severity: High)_
- [CAPEC-24 — Filter Failure through Buffer Overflow](https://capec.mitre.org/data/definitions/24.html) _(Severity: High)_
- [CAPEC-42 — MIME Conversion](https://capec.mitre.org/data/definitions/42.html) _(Severity: High)_
- [CAPEC-44 — Overflow Binary Resource File](https://capec.mitre.org/data/definitions/44.html) _(Severity: Very High)_
- [CAPEC-45 — Buffer Overflow via Symbolic Links](https://capec.mitre.org/data/definitions/45.html) _(Severity: High)_
- [CAPEC-46 — Overflow Variables and Tags](https://capec.mitre.org/data/definitions/46.html) _(Severity: High)_
- [CAPEC-100 — Overflow Buffers](https://capec.mitre.org/data/definitions/100.html) _(Severity: Very High)_

## Referenzen

- <https://ssd-disclosure.com/ssd-advisory--uniview-preauth-rce/>
- <https://www.uniview.com/About_Us/Security/Notice/202112/920471_140493_0.htm>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2021-45039/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_