INSPECTING ARCHIVED INTELLIGENCE (OUTDATED VERSION).
ATTENTION: This report is based on previous data. New intelligence sources have been linked and the Executive Summary and Mitigations need to be re-synthesized.

Palo Alto PAN-OS Zero-Day Exploited Nation-state Actors

| 2026-05-07 00:00 CRITICAL HIGH
Executive Summary AI-generated
The threat actor behind the exploitation of Palo Alto PAN-OS zero-day vulnerability CVE-2026-0300 is suspected to be a nation-state. The attack, which has been ongoing for nearly a month, utilizes EarthWorm tunneling tool and Active Directory enumeration techniques to gain unauthorized access to exposed firewalls and destroy logs. This indicates that the threat actor prioritized identity trust abuse over traditional network-layer pivoting, effectively reducing their footprint.
Technical Mitigations AI-generated
* Limit access to trusted internal networks: Palo Alto Networks notes that risk is greatly reduced if organizations follow best practices, such as restricting sensitive portals to trusted internal networks only. * Secure access to User-ID Authentication Portal: Restricting access to the User-ID Authentication Portal per best practice guidelines can help reduce the risk of exploitation by limiting exposure to public internet and untrusted IP addresses. * Keep PAN-OS software up-to-date: Palo Alto Networks advises that fixes for the vulnerability are expected from May 13, 2026. Keeping PAN-OS software up-to-date with the latest patches is essential in preventing exploitation until a fix is available. * Monitor firewall logs and activity: Organizations should monitor their firewall logs and activity to detect any suspicious behavior or attempts to exploit the vulnerability. * Implement intrusion detection and prevention systems (IDPS): IDPS can help detect and prevent attacks by identifying potential vulnerabilities and blocking malicious traffic before it reaches the network.
Intelligence Metadata
Actors / Malware / CVEs / Campaigns
APT41APT41Volt TyphoonVolt Typhoon CVE-2026-0300CVE-2026-0300
Target & Sectors
NORTH_AMERICA NORTH_AMERICA MIDDLE_EAST MIDDLE_EAST EUROPE EUROPE
Incident Timeline
‎2026/05/07
Palo Alto Networks exploited CVE-2026-0300 in the wild.
organisation EarthWorm
threat_actor APT41
threat_actor Volt Typhoon
organisation NAT
organisation PAN
organisation PAN-OS
organisation User-ID
organisation Palo Alto Networks
organisation Shadowserver
infrastructure 12.1
infrastructure 12.1.4-h5
infrastructure 12.1.7
organisation ETA
infrastructure Windows
infrastructure Linux
infrastructure Macos
organisation SecurityAffairs
organisation IP
organisation User-ID Authentication Portal (Captive Portal
organisation Prisma Access None
organisation Prisma Access
organisation Panorama
organisation the User-ID Authentication Portal
organisation RDP
organisation SSH
organisation CL-STA-1132
‎May 9, 2026
Threat actors exploited a zero-day vulnerability in Palo Alto PAN-OS.
‎May 13, 2026
Threat actors exploited a zero-day vulnerability in Palo Alto PAN-OS.
‎May 13
Palo Alto Networks released software fixes for a zero-day exploit in PAN-OS on May 13.
organisation CyberScoop
Tactical Metrics
Metrics
infrastructure
‎Windows
Affected Product
Metrics
infrastructure
‎Linux
Affected Product
Metrics
infrastructure
‎Macos
Affected Product
Metrics
infrastructure
‎11.1
Software Version
Metrics
infrastructure
‎82.080.467
Software Version
Metrics
infrastructure
‎67.206.213
Software Version
Metrics
infrastructure
‎136.0.8
Software Version
Metrics
infrastructure
‎146.70.100
Software Version
Metrics
infrastructure
‎149.104.66
Software Version
Metrics
infrastructure
‎2.0
Software Version
Metrics
infrastructure
‎2.0-linux
Software Version
Metrics
infrastructure
‎532.31
Software Version
Metrics
infrastructure
‎5.5
Software Version
Metrics
infrastructure
‎10.0
Software Version
Metrics
infrastructure
‎537.36
Software Version
Metrics
infrastructure
‎138.0.0
Software Version
Metrics
infrastructure
‎12.1
Software Version
Metrics
infrastructure
‎12.1.4-h5
Software Version
Metrics
infrastructure
‎12.1.7
Software Version