A vulnerability was found in Mozilla Thunderbird up to 139. It has been classified as critical. This affects an unknown part. The manipulation leads to memory corruption.
This vulnerability is uniquely identified as CVE-2025-6436. It is possible to initiate the attack remotely. There is no exploit available.
It is recommended to upgrade the affected component.
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CVE-2025-6436 | Mozilla Thunderbird up to 139 memory corruption (Nessus ID 240334)
A vulnerability was found in Mozilla Thunderbird up to 139. It has been classified as critical. This affects an unknown part. The manipulation leads to memory corruption. This vulnerability is uniquely identified as CVE-2025-6436. It is…
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IoC Intelligence (1 Indikatoren)
CVE-2025-6436
IR-PLAYBOOK-VULN-REMEDIATIONMEDIUM
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title: Detect Exploitation - CVE-2025-6436 | Mozilla Thunderbird up to 139 memory corruption (Nessus ID 240334)
id: 192bc77a-ec89-42ef-9039-aa8b17766005
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-2025-6436 | Mozilla Thunde" 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-2025-6436 | Mozilla Thunderbird up t.... Basierend auf 368k Vektor-Korrelationen werden sofortige Isolationsmaßnahmen für betroffene Endpunkte empfohlen.
🛡️ Angriffsfläche & Exposure
Netzwerk/Remote-Zugriff ohne Vorauthentifizierung möglich.
⚡ Empfohlene Sofortmaßnahmen
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- 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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