Palo Alto Networks · PAN-OS
CVE-2024-3393
PAN-OS: Firewall Denial of Service (DoS) in DNS Security Using a Specially Crafted Packet
What it is
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.
CISA: Palo Alto Networks PAN-OS contains a vulnerability in parsing and logging malicious DNS packets in the DNS Security feature that, when exploited, allows an unauthenticated attacker to remotely reboot the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.
What to do
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Deadline for US federal agencies: January 20, 2025
More exploited flaws from Palo Alto Networks
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Oct 14, 2026 | Code Injection | PAN-OS | High 8.6 | 1.7% |
| May 29, 2026 | Authentication Bypass | PAN-OS | High 7.8 | 95% |
| May 6, 2026 | Out-of-bounds Write | PAN-OS | Critical 9.3 | 42% |
| Feb 20, 2025 | File Read | PAN-OS | High 7.1 | 2.0% |
| Feb 18, 2025 | Authentication Bypass | PAN-OS | High 8.8 | 98% |
| Nov 18, 2024 | Management Interface Authentication Bypass | PAN-OS | Critical 9.3 | 99.8% |
| Nov 18, 2024 | Management Interface OS Command Injection | PAN-OS | Medium 6.9 | 94% |
| Apr 12, 2024 | Command Injection | PAN-OS | Critical 10.0 | >99.9% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.