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HomeTopics 1Application SecurityUrgent Patch Required: Critical Palo Alto Networks OS Flaw Under Active Attack

Urgent Patch Required: Critical Palo Alto Networks OS Flaw Under Active Attack


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A recently discovered critical vulnerability in Palo Alto Networks’ PAN-OS operating system is under active exploitation by attackers.

This zero-day flaw, identified as CVE-2024-3400 and assigned a severity score of 10.0 (critical) by the Common Vulnerability Scoring System (CVSS), poses a significant risk to organizations using Palo Alto Networks firewalls.

Understanding the Threat

The vulnerability resides in the GlobalProtect functionality of PAN-OS, a feature enabling secure remote access to corporate networks. Attackers exploiting CVE-2024-3400 could potentially execute arbitrary code with root privileges on the firewall itself. This grants them complete control over the device, allowing them to:

  • Deploy malware and ransomware: With full access to the firewall, attackers could deploy malicious software across the protected network.
  • Steal sensitive data: Compromised firewalls could become a conduit for attackers to exfiltrate confidential information from the network.
  • Disrupt network operations: Attackers could manipulate firewall configurations or launch denial-of-service attacks, disrupting critical business operations.

What We Know So Far

Palo Alto Networks issued a security advisory on April 12, 2024, acknowledging the vulnerability and urging customers to implement the available patch immediately. While technical details concerning the exploit are limited, Palo Alto Networks has confirmed limited attacks leveraging this vulnerability.

Protecting Your Organization

Here are 10 critical steps organizations using Palo Alto Networks firewalls can take to mitigate the risk associated with CVE-2024-3400:

  1. Patch Immediately: Apply the security patch released by Palo Alto Networks as soon as possible. Prioritize patching firewalls directly connected to the internet.
  2. Isolate Impacted Systems: If immediate patching is not feasible, consider isolating potentially vulnerable firewalls from critical network segments to minimize potential damage.
  3. Enable Threat Prevention: If you have a Palo Alto Networks Threat Prevention subscription, enable Threat ID 95187 to gain additional protection against this specific exploit.
  4. Heighten Monitoring: Increase monitoring for suspicious activity on your network, focusing on unauthorized access attempts and unusual data exfiltration.
  5. Educate Users: Remind employees to be vigilant against phishing attempts and other social engineering tactics that attackers might use to gain a foothold in your network.
  6. Segment Your Network: Implementing network segmentation can limit the blast radius of a potential attack, minimizing potential damage.
  7. Maintain Backups: Ensure regular backups of your critical systems to facilitate recovery in case of a cyberattack.
  8. Update Threat Intelligence: Keep your threat intelligence feeds updated to stay informed about the latest exploit techniques and emerging threats.
  9. Test Your Defenses: Regularly test your incident response plans and security controls to ensure they are effective in mitigating cyberattacks.
  10. Stay Informed: Continuously monitor cybersecurity advisories from Palo Alto Networks and other trusted sources for updates on this evolving threat.


The discovery of a critical zero-day vulnerability in Palo Alto Networks’ PAN-OS highlights the importance of a proactive approach to cybersecurity. By implementing a layered security strategy, staying informed about emerging threats, and patching vulnerabilities promptly, organizations can significantly reduce their cyber risk. There is no silver bullet in cybersecurity, but vigilance, rapid response, and a commitment to best practices can help organizations weather even the most critical security challenges.

Ouaissou DEMBELE
Ouaissou DEMBELEhttps://cybercory.com
Ouaissou DEMBELE is an accomplished cybersecurity professional and the Editor-In-Chief of cybercory.com. He has over 10 years of experience in the field, with a particular focus on Ethical Hacking, Data Security & GRC. Currently, Ouaissou serves as the Co-founder & Chief Information Security Officer (CISO) at Saintynet, a leading provider of IT solutions and services. In this role, he is responsible for managing the company's cybersecurity strategy, ensuring compliance with relevant regulations, and identifying and mitigating potential threats, as well as helping the company customers for better & long term cybersecurity strategy. Prior to his work at Saintynet, Ouaissou held various positions in the IT industry, including as a consultant. He has also served as a speaker and trainer at industry conferences and events, sharing his expertise and insights with fellow professionals. Ouaissou holds a number of certifications in cybersecurity, including the Cisco Certified Network Professional - Security (CCNP Security) and the Certified Ethical Hacker (CEH), ITIL. With his wealth of experience and knowledge, Ouaissou is a valuable member of the cybercory team and a trusted advisor to clients seeking to enhance their cybersecurity posture.


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