A vulnerability, which was classified as critical, has been found in Microsoft Windows up to Server 2022. This affects an unknown part of the component Recovery Environment Agent. This manipulation causes an unknown weakness.
This vulnerability is registered as CVE-2021-43239. Remote exploitation of the attack is possible. No exploit is available.
Applying a patch is the recommended action to fix this issue.
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CVE-2021-43239 | Microsoft Windows up to Server 2022 Recovery Environment Agent (WID-SEC-2025-2220)
A vulnerability, which was classified as critical, has been found in Microsoft Windows up to Server 2022. This affects an unknown part of the component Recovery Environment Agent. This manipulation causes an unknown weakness. This…
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IoC Intelligence (1 Indikatoren)
CVE-2021-43239
CTI Threat Relationship Graph2 Knoten / 1 Relationen
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title: Detect Exploitation - CVE-2021-43239 | Microsoft Windows up to Server 2022 Recovery Environment Agent (WID-SEC-2025-2220)
id: 10ff610e-a2b0-4e0b-9c2d-470f6012aebe
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_accessrule CTI_Threat_Indicator {
meta:
author = "iShareStuff CTI Automated Detection Engine"
date = "2026-09-24"
description = "YARA Signature for "
strings:
$str = "CVE-2021-43239 | Microsoft Win" 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-2021-43239 | Microsoft Windows up to.... 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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