CVE-2026-0317 in PAN-OS
Summary
by MITRE • 10/15/2026
A denial of service vulnerability in Palo Alto Networks PAN-OS software enables an authenticated user with a read-only administrator role to cause a denial of service (DoS) condition by sending a specially crafted API request.
The security risk posed by this issue is significantly minimized by restricting access to the management web interface to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 .
Cloud NGFW, Panorama, and Prisma® Access are not affected by this vulnerability.
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Analysis
by VulDB Data Team • 10/15/2026
A critical denial of service vulnerability exists within the Palo Alto Networks PAN-OS software platform, specifically affecting versions prior to 9.0.25-h6, 8.1.24-h7, and earlier releases in those branches. This flaw allows an authenticated user possessing a read-only administrator role to trigger a system crash or unresponsive state by submitting a specially crafted API request. The vulnerability stems from improper handling of specific input parameters within the management plane's application programming interface logic. When the malformed request is processed, it causes excessive resource consumption or a memory corruption event that leads to service interruption for the firewall device itself. This represents a significant operational risk as it enables an attacker with minimal privileges to disrupt network security services without requiring elevated administrative rights.
The technical nature of this flaw aligns closely with CWE-400, which describes conditions where resources are not properly limited or controlled during allocation, leading to denial of service. In the context of Palo Alto Networks PAN-OS, the vulnerability exploits a logic error in how certain API endpoints validate and process incoming data structures from authenticated sessions. Although the attacker must first authenticate with read-only access, this lowers the barrier for exploitation compared to vulnerabilities requiring full administrative privileges. The attack vector is classified as network-based because it relies on sending requests over the management interface, typically accessible via HTTPS or XML-API protocols. This aligns with MITRE ATT&CK technique T1499, Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion through application layer attacks.
The operational impact of this vulnerability is severe for organizations relying on PAN-OS firewalls as their primary perimeter defense mechanism. A successful exploitation results in a denial of service condition where the firewall ceases to process traffic effectively or becomes entirely unresponsive. This disruption can lead to significant network outages, loss of visibility into security events, and potential exposure of internal assets if failover mechanisms do not activate correctly. Since the vulnerability affects devices that are actively managing network traffic, the downtime directly correlates with reduced security posture and operational continuity for the affected enterprise or service provider environment.
To mitigate this risk, Palo Alto Networks has released updated software versions that address the underlying code defects responsible for the improper input handling. Administrators should immediately upgrade their PAN-OS installations to version 9.0.25-h6, 8.1.24-h7, or later recommended releases within those respective branches. In addition to patching, organizations are strongly advised to adhere to strict access control policies by restricting management interface access exclusively to trusted internal IP addresses as outlined in Palo Alto Networks best practice deployment guidelines. This network segmentation strategy significantly reduces the attack surface by preventing external actors from reaching the vulnerable API endpoints even if they possess valid credentials. Furthermore, implementing multi-factor authentication for all administrative accounts adds an additional layer of security that complicates unauthorized access attempts.
It is important to note that this specific vulnerability does not affect Cloud NGFW, Panorama management servers, or Prisma Access environments. These platforms utilize different architectural components and codebases that are immune to the particular API handling flaw present in standalone PAN-OS firewall devices. Organizations operating a hybrid environment should verify which systems fall under the affected scope while ensuring consistent security policies across all managed infrastructure. Continuous monitoring of system logs for unusual authentication patterns or resource spikes can also aid in early detection of potential exploitation attempts before they result in service disruption.