A vulnerability marked as very critical has been reported in Exim up to 4.99.4. Affected by this vulnerability is an unknown functionality of the component pipe transport. This manipulation of the argument force_command causes improper privilege management.
This vulnerability is registered as CVE-2026-66141. Remote exploitation of the attack is possible. No exploit is available.
It is suggested to upgrade the affected component.
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CVE-2026-66141 | Exim up to 4.99.4 pipe transport force_command privileges management (EUVD-2026-48479)
A vulnerability marked as very critical has been reported in Exim up to 4.99.4. Affected by this vulnerability is an unknown functionality of the component pipe transport. This manipulation of the argument force_command causes improper…
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IoC Intelligence (1 Indikatoren)
CVE-2026-66141
IR-PLAYBOOK-RCEHIGH
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SOC Incident Playbook: Remote Code Execution (RCE) Defense
1-Click Detection Engineering: Sigma & YARA RulesSOC Ready
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title: Detect Exploitation - CVE-2026-66141 | Exim up to 4.99.4 pipe transport force_command privileges management (EUVD-2026-48479)
id: 8d36612c-2852-44c5-8e52-17686453624c
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-2026-66141 | Exim up to 4." ascii wide
condition:
any of them
}INFRASTRUCTURE BLAST RADIUS & EXPOSURE
Live-Vektor: NETWORK
LOCALIZED
Perimeter & Ingress
GEFÄHRDET (75%)
Lateral Pivot & AD
Geringes Risiko
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-2026-66141 | Exim up to 4.99.4 pipe .... 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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