CVE-2026-0227
Published: 15 January 2026
Summary
CVE-2026-0227 is a medium-severity Improper Check for Unusual or Exceptional Conditions (CWE-754) vulnerability in Paloaltonetworks Pan-Os. Its CVSS base score is 6.6 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 21.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SC-5 (Denial-of-service Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-0227 is a vulnerability in Palo Alto Networks PAN-OS software that enables an unauthenticated attacker to cause a denial of service (DoS) condition on the firewall. Repeated attempts to trigger the issue can force the firewall into maintenance mode. The vulnerability is associated with CWE-754 and carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating high availability impact with no effects on confidentiality or integrity.
An unauthenticated attacker with network access to the affected firewall can exploit this vulnerability remotely with low complexity and no requirement for user interaction or privileges. Successful exploitation disrupts firewall operations, and sustained attacks lead to the device entering maintenance mode, rendering it unavailable for traffic processing.
Mitigation details and patches are available in the vendor advisory at https://security.paloaltonetworks.com/CVE-2026-0227, published on 2026-01-15. Security practitioners should consult this reference for specific remediation steps.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-2715
Vulnerability details
A vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to cause a denial of service (DoS) to the firewall. Repeated attempts to trigger this issue results in the firewall entering into maintenance mode.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Direct remote exploitation of software vulnerability to crash/impair firewall availability and force maintenance mode.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the vulnerability by identifying, reporting, and applying vendor patches for the PAN-OS DoS flaw.
Protects the firewall against denial-of-service events triggered by unauthenticated remote exploitation of this vulnerability.
Enforces boundary protection to limit network access to the firewall's vulnerable interfaces, reducing unauthenticated attack opportunities.