---
cve: "CVE-2021-21892"
severity: "CRITICAL"
cvss: 9.9
epss: "30.4%"
vendor: "n/a"
kev: false
exploited: false
published: "2021-12-22 19:15:09"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-10-26T04:30:30+01:00"
---

# CVE-2021-21892

> 9.9 CRITICAL

## Beschreibung

A stack-based buffer overflow vulnerability exists in the Web Manager FsUnmount functionality of Lantronix PremierWave 2050 8.9.0.0R4 (in QEMU). A specially crafted HTTP request can lead to remote code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.

## CNA-Record (Kanon, cvelistV5)

- CNA: **talos**
- State: PUBLISHED
- Stand: 2024-08-03 18:30:22
- CNA-CVSS: **9.9** (`CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`)

## CVSS-Vektor

```
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
```

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

## Schwachstellen-Klasse

- **CWE-121** — Stack-based Buffer Overflow
  A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

## Referenzen

- <https://talosintelligence.com/vulnerability_reports/TALOS-2021-1335>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2021-21892/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_