A vulnerability was found in Zyxel NAS326 and NAS542. It has been classified as critical. Affected is an unknown function of the component Web Server. The manipulation leads to os command injection.
This vulnerability is uniquely identified as CVE-2023-4473. The attack is possible to be carried out remotely. No exploit exists.
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CVE-2023-4473 | Zyxel NAS326/NAS542 Web Server os command injection (EUVD-2023-54328)
A vulnerability was found in Zyxel NAS326 and NAS542. It has been classified as critical. Affected is an unknown function of the component Web Server. The manipulation leads to os command injection. This vulnerability is uniquely…
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IoC Intelligence (1 Indikatoren)
CVE-2023-4473
CTI Threat Relationship Graph3 Knoten / 2 Relationen
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title: Detect Exploitation - CVE-2023-4473 | Zyxel NAS326/NAS542 Web Server os command injection (EUVD-2023-54328)
id: 2ebeac6b-fce5-4033-ae7a-294532a9f4ad
status: experimental
description: Automatisch generierte SIEM-Erkennungsregel basierend auf CTI Intelligence
references:
- https://tsecurity.de/
author: iShareStuff CTI Automated Detection Engine
date: 2026-09-24
logsource:
category: network_connection
product: any
detection:
selection:
CommandLine|contains:
- 'exploit'
condition: selection
falsepositives:
- Legitime administrative Zugriffe oder Penetrationstests
level: high
tags:
- attack.initial_access
- attack.t1190rule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2023-4473 | Zyxel NAS326/N" ascii wide
condition:
any of them
}INFRASTRUCTURE BLAST RADIUS & EXPOSURE
Live-Vektor: LOCAL
LOCALIZED
Perimeter & Ingress
Geringes Risiko
Lateral Pivot & AD
GEFÄHRDET (80%)
Crown Jewels & DB
Geringes Risiko
Supply Chain Reach
Geringes Risiko
tsecurity.de Cognitive Threat RAG
Fokus-Vektor:
Kognitive Analyse für identifizierte Bedrohung: Erhöhte Bedrohungslage im Bereich CVE-2023-4473 | Zyxel NAS326/NAS542 Web .... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
- 1. Perimeter-Inspektion: Relevante Portfreigaben und exponierte Endpunkte unverzüglich scannen.
- 2. Patch-Applikation: Hersteller-Hotfix einspielen oder betroffene Daemons in isolierte DMZ-Segmente überführen.
- 3. Telemetrie & EDR-Alerts: Prozessaufrufe und Child-Processes auf anomale Shell-Spawns überwachen.
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