📢 UAT-4356 déploie le backdoor FIRESTARTER sur les équipements Cisco Firepower via des CVE n-day
📝 ## 🔍 Contexte

Publié le 23 avril 2026 par **Cisco Talos**, cet article constitu...
📖 cyberveille : https://cyberveille.ch/posts/2026-04-26-uat-4356-deploie-le-backdoor-firestarter-sur-les-equipements-cisco-firepower-via-des-cve-n-day/
🌐 source : https://blog.talosintelligence.com/uat-4356-firestarter/?utm_source=substack&utm_medium=email
#ArcaneDoor #CVE_2025_20333 #Cyberveille

UAT-4356 déploie le backdoor FIRESTARTER sur les équipements Cisco Firepower via des CVE n-day

🔍 Contexte Publié le 23 avril 2026 par Cisco Talos, cet article constitue une analyse technique détaillée d’une campagne active menée par le groupe UAT-4356, précédemment attribué à la campagne étatique ArcaneDoor (début 2024), ciblant les équipements réseau périmètriques à des fins d’espionnage. 🎯 Vecteur d’accès initial UAT-4356 a exploité deux vulnérabilités n-day affectant le système d’exploitation Cisco FXOS (Firepower eXtensible Operating System) : CVE-2025-20333 CVE-2025-20362 Ces vulnérabilités ont permis un accès non autorisé aux équipements Cisco Firepower, ASA et FTD.

CyberVeille

Firestarter Malware Evades Cisco Firewall Updates, Persists Across Reboots

A custom backdoor called Firestarter has been discovered evading Cisco firewall updates and persisting across reboots, posing a significant threat to cybersecurity. This sophisticated malware is attributed to a threat actor linked to cyberespionage campaigns, including the notorious ArcaneDoor operation.

https://osintsights.com/firestarter-malware-evades-cisco-firewall-updates-persists-across-reboots?utm_source=mastodon&utm_medium=social

#FirestarterMalware #CiscoFirewall #Uat4356 #Arcanedoor #Cyberespionage

Firestarter Malware Evades Cisco Firewall Updates, Persists Across Reboots

Learn how Firestarter malware evades Cisco firewall updates and persists across reboots. Discover the threat actor behind it and protect your devices now with expert security tips.

OSINTSights

🚨 The Cybersecurity and Infrastructure Security Agency (#CISA) has flagged active attacks exploiting two critical flaws in #Cisco ASA and Firepower devices (CVE-2025-20362 + CVE-2025-20333) used in the #ArcaneDoor campaign.

Read: https://hackread.com/cisa-attacks-cisco-asa-firepower-flaws/

#CyberSecurity #Vulnerability #Infosec #Firepower

CISA Warns of Active Attacks on Cisco ASA and Firepower Flaws

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Cisco : exploitation active des zero-days ASA/FTD (CVE-2025-20362 & CVE-2025-20333) causant des redémarrages en boucle

Source : BleepingComputer — Cisco avertit que deux vulnérabilités déjà exploitées en zero-day contre ses pare-feux ASA/FTD (CVE-2025-20362 et CVE-2025-20333) sont désormais utilisées pour provoquer des redémarrages en boucle, entraînant des dénis de service. La CISA a émis une directive d’urgence pour les agences fédérales américaines. • Vulnérabilités et impact: les failles CVE-2025-20362 (accès non authentifié à des endpoints URL restreints) et CVE-2025-20333 (RCE après authentification) peuvent, en chaîne, donner un contrôle total des systèmes non patchés. Un nouvel artéfact d’attaque observé le 5 novembre 2025 force des redémarrages inattendus des appareils, causant un DoS.

CyberVeille
📢 Exploitation active de failles critiques WebVPN sur Cisco ASA/FTD (CVE-2025-20362/20333/20363)
📝 Selon Horizon3.ai, plusieurs vulnérabilités critiques affectant les...
📖 cyberveille : https://cyberveille.ch/posts/2025-10-10-exploitation-active-de-failles-critiques-webvpn-sur-cisco-asa-ftd-cve-2025-20362-20333-20363/
🌐 source : https://horizon3.ai/attack-research/vulnerabilities/cve-2025-20362-cve-2025-20333-cve-2025-20363/
#ArcaneDoor #CISA_Emergency_Directive #Cyberveille
Exploitation active de failles critiques WebVPN sur Cisco ASA/FTD (CVE-2025-20362/20333/20363)

Selon Horizon3.ai, plusieurs vulnérabilités critiques affectant les composants WebVPN de Cisco ASA et FTD sont exploitées activement par l’acteur UAT4356, dit ArcaneDoor, ce qui a conduit la CISA à publier l’Emergency Directive 25-03. Les versions concernées sont Cisco ASA 9.16–9.23 et Cisco FTD 7.0–7.7. 🚨 Vulnérabilités et impact CVE-2025-20362 (bypass d’authentification) permet, via des requêtes HTTP(S) forgées, d’atteindre des endpoints WebVPN restreints. Chaînée avec CVE-2025-20333, cette faille conduit à une exécution de code à distance (RCE) en root, sans authentification, via des requêtes HTTPS malveillantes. CVE-2025-20363 constitue une RCE distincte affectant ASA/FTD sans authentification et certains composants Cisco IOS avec authentification. 🎯 Menace et attribution

CyberVeille
Censys Researchers investigated the threat actor infrastructure behind the #ArcaneDoor campaign, led by previously unknown state-sponsored threat actor #UAT4356, and found networks, certificate indicators, and software hinting at potential ties to China. https://censys.com/analysis-of-arcanedoor-threat-infrastructure-suggests-potential-ties-to-chinese-based-actor/ #CensysResearch
Analysis of ArcaneDoor Threat Infrastructure Suggests Potential Ties to Chinese-based Actor

Censys
Zero-day flaws CVE-2024-20353 & CVE-2024-20359 in Cisco ASA & FTD have been exploited in “ArcaneDoor” state-sponsored campaign since Jan 2024. Censys detects over 162k Cisco ASA devices worldwide, with a significant numbers in the U.S. Learn more about the global impact :earth_americas:: https://censys.com/cve-2024-20353/ #ArcaneDoor #Cisco #CensysResearch
April 30, 2024: Cisco ASA and FTD vulnerabilities lead to breached government networks

Censys

The blog post from Talos Intelligence reveals a sophisticated espionage campaign named ArcaneDoor, which targets perimeter network devices from various vendors. These devices are essential for data entry and exit, making them attractive targets for state-sponsored actors. The campaign has seen a significant increase in the past two years, particularly affecting telecommunications providers and energy sector organizations. Cisco Talos, with its extensive visibility into network security, played a key role in identifying this campaign.

https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/

#cybersecurity #cisco #talos #intelligence #ArcaneDoor #network

ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices

Cisco is aware of new activity targeting certain Cisco Adaptive Security Appliances (ASA) 5500-X Series and has released three CVEs related to the event. We assess with high confidence this activity is related to same threat actor as ArcaneDoor in 2024.

Cisco Talos Blog
ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices

Cisco is aware of new activity targeting certain Cisco Adaptive Security Appliances (ASA) 5500-X Series and has released three CVEs related to the event. We assess with high confidence this activity is related to same threat actor as ArcaneDoor in 2024.

Cisco Talos Blog

Potential APT campaign targets network devices, exploiting vulnerabilities to deploy custom malware. Utilizing data exfiltration, lateral movement, and persistent access along with sophisticated in-memory techniques and crash dump hooks to evade detection. #CyberSecurity
#ArcaneDoor

https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/

ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices

Cisco is aware of new activity targeting certain Cisco Adaptive Security Appliances (ASA) 5500-X Series and has released three CVEs related to the event. We assess with high confidence this activity is related to same threat actor as ArcaneDoor in 2024.

Cisco Talos Blog