Palo Alto Networks Fixes Critical Zero-Day Vulnerability in PAN-OS

PAN-OS Palo Alto Network
PAN-OS Palo Alto Network

Palo Alto Networks has successfully resolved a critical zero-day vulnerability that existed in PAN-OS, their operating system.

Palo Alto Networks, a leading cybersecurity company, recently disclosed a critical zero-day vulnerability (CVE-2024-3400) actively exploited in the wild. This vulnerability impacts PAN-OS, the operating system that powers their firewalls.


  • High Risk: The vulnerability allows unauthenticated remote code execution, granting attackers complete control over the firewall. This can lead to a complete network breach if exploited.
  • Zero-Day Threat: The absence of a prior patch leaves users vulnerable until they apply the update.


  • Remote Code Execution: The vulnerability allows unauthenticated attackers to remotely execute malicious code with the highest level of privileges on affected firewalls. This can grant attackers complete control over the firewall, potentially compromising the entire network it protects.
  • Data Breach: Attackers can exploit this vulnerability to steal sensitive data from the compromised network.
  • Lateral Movement: With control over the firewall, attackers can move laterally within the network, infecting other devices and escalating their privileges.

Security Measures:

  • Patch Immediately: Palo Alto Networks has released patches to address this vulnerability. Organizations using PAN-OS firewalls should prioritize installing the updates as soon as possible. Security researchers recommend applying the patch by April 14th, 2024.
  • Disable GlobalProtect (if not in use): The vulnerability resides within the GlobalProtect functionality. Disabling it can be a temporary measure if a patch cannot be applied immediately, but only if GlobalProtect is not a critical service.
  • Network Segmentation: Segmenting your network can limit the damage caused by a breach. Even if the firewall is compromised, attackers may find it more difficult to reach sensitive areas of the network.
  • Security Monitoring: Maintain robust security monitoring to detect suspicious activity on your network. Early detection can help mitigate the impact of an attack.

The Analysis

Technical Considerations:

  • Attack Vector: The exploit likely targets a specific flaw in the GlobalProtect functionality of PAN-OS. Disabling it can be a temporary measure, but not a long-term solution if GlobalProtect is essential.
  • Exploitation Potential: The wide use of Palo Alto firewalls across various industries suggests widespread potential exploitation.


  • Patching is Paramount: Organizations must prioritize immediate patching of their PAN-OS firewalls. Delaying this critical update exposes them to a high risk of compromise.
  • Layered Security: Network segmentation and robust security monitoring are crucial to minimize the impact of a potential breach, even with patching in place.

Palo Alto Fixes CVE-2024-3400 PAN-OS: OS Command Injection Vulnerability

A command injection vulnerability in the GlobalProtect feature of Palo Alto Networks PAN-OS software for specific PAN-OS versions and distinct feature configurations may enable an unauthenticated attacker to execute arbitrary code with root privileges on the firewall.

Cloud NGFW, Panorama appliances, and Prisma Access are not impacted by this vulnerability.

This issue is fixed by Palo Alto security in hotfix releases of PAN-OS 10.2.9-h1, PAN-OS 11.0.4-h1, PAN-OS 11.1.2-h3, and in all later PAN-OS versions. Hotfixes for other commonly deployed maintenance releases will also be made available to address this issue.

If you are unable to apply the Threat Prevention based mitigation at this time, you can still mitigate the impact of this vulnerability by temporarily disabling device telemetry until the device is upgraded to a fixed PAN-OS version. Once upgraded, device telemetry should be re-enabled on the device.

What Users Can Do:

Contact your IT Security team: Report any unusual activity on your network or firewall to your IT security team.
Stay Informed: Keep yourself updated on the latest security threats and vulnerabilities.

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