CVE-2026-0321 PAN-OS: Denial of Service (DoS) Vulnerabilities in Network Services
Unauthenticated attackers can cause a denial of service on PAN-OS firewalls by sending crafted network traffic, forcing the device into maintenance mode.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-0321?
CVE-2026-0321 is a medium-severity denial of service vulnerability in Palo Alto Networks Cloud NGFW, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Denial of service vulnerabilities in Palo Alto Networks PAN-OS® software allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition by sending specially crafted network traffic to or through a dataplane interface. Repeated attempts to trigger this condition result in the firewall entering maintenance mode.
Cloud NGFW and Panorama are not affected by this vulnerability.
Weakness: CWE-754
Which versions are affected by CVE-2026-0321?
How do I fix CVE-2026-0321?
No fix has been published for CVE-2026-0321 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-0321 being exploited?
There is no known exploitation of CVE-2026-0321 in the wild and no public exploit code.
Sources
Also known as GHSA-5f3h-q3pp-xh59.