Threat actorcritical
ArcaneDoor - New espionage-focused campaign found targeting perimeter network devices
Vulnerabilities mentioned
All| CVE | Vulnerability | CVSS | EPSS | Signals | Published |
|---|---|---|---|---|---|
| CVE-2018-0101 | A vulnerability in the Secure Sockets Layer (SSL) VPN functionality of the Cisco Adaptive Security Appliance (ASA) Software could allow an unauthenticated… | 10.0 | 87% | PoC ×2 | |
CVE-2024-20353+1 related CVE | Unauthenticated Device-Reload DoS in Cisco ASA and FTD Web Servers | 8.6 group max | 70% | KEVPoC | KEV |
CVE-2025-20333+1 related CVE | Authenticated Buffer Overflow RCE in Cisco ASA/FTD VPN Web Server | 9.9 group max | 71% | KEV | KEV |
| CVE-2025-20363 | A vulnerability in the web services of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software… | 9.0 | 7% |
Indicators of compromise
auto-extracted · verify before use · export allAll| Type | Indicator | Context |
|---|---|---|
| md5 | 1515480f4b538b669648b17c02337098 | n't already exist • Create disk0:/csco_config/97/webcontent/1515480F4B538B669648B17C02337098 from hash.txt • Append index.txt to disk0:/csco_config/97/w |
From the original article
13 min read at blog.talosintelligence.com
*Update 2025-09-25: Cisco is aware of new activity targeting certain Cisco Adaptive Security Appliances (ASA) 5500-X Series and has released three CVE’s related to the event: CVE-2025-20333 , CVE-2025-20362 and CVE-2025-20363 . The following Snort Rules cover these vulnerabilities: 65340, 46897. We assess with high confidence this activity is related to same threat actor as ArcaneDoor in 2024.
blog.talosintelligence.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.