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CVE-2024-3393: Palo Alto Networks PAN-OS Malicious DNS Packet Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-12-30
• EPSS: 29.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-12-27 · updated 2026-06-17
• Weakness: CWE-754

Description

A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an unauthenticated attacker to send a malicious packet through the data plane of the firewall that reboots the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.

Affected products

• Palo Alto Networks PAN-OS: from 11.1.0 through 11.1.1; from 11.2.0 before 11.2.3; 10.1.14, 10.1.14-h2, 10.1.14-h4, 10.1.14-h6, 10.2.8, 10.2.8-h10 (+51) — fixed in 11.2.3
• Palo Alto Networks Prisma Access: all versions

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 11.2.3. Check the vendor advisory for mitigations.

References

• https://security.paloaltonetworks.com/CVE-2024-3393
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-3393

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