CVE-2024-3384: PAN-OS: Firewall Denial of Service (DoS) via Malformed NTLM Packets

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-10 · updated 2026-06-17
Weakness: CWE-1286

Description

A vulnerability in Palo Alto Networks PAN-OS software enables a remote attacker to reboot PAN-OS firewalls when receiving Windows New Technology LAN Manager (NTLM) packets from Windows servers. Repeated attacks eventually cause the firewall to enter maintenance mode, which requires manual intervention to bring the firewall back online.

Affected products

Palo Alto Networks PAN-OS: from 8.1.0 before 8.1.24; from 9.0.0 before 9.0.17; from 9.1.0 before 9.1.15; from 10.0.0 before 10.0.12; 9.1.15 — fixed in 8.1.24, 9.0.17, 9.1.15, 10.0.12
Palo Alto Networks PAN-OS: from 8.1.0 before 8.1.24; from 9.0.0 before 9.0.17; from 9.1.0 before 9.1.15-h1; from 10.0.0 before 10.0.12 — fixed in 8.1.24, 9.0.17, 9.1.15-h1, 10.0.12

How to fix

Upgrade to a fixed version: Palo Alto Networks PAN-OS 8.1.24, 9.0.17, 9.1.15, 10.0.12; Palo Alto Networks PAN-OS 8.1.24, 9.0.17, 9.1.15-h1, 10.0.12. Check the vendor advisory for mitigations.

References

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