High severity · published Jan 15, 2026
CVE-2026-0227
PAN-OS: Firewall Denial of Service (DoS) in GlobalProtect Gateway and Portal
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
PAN-OS · Palo Alto Networks
12.1.2 before 12.1.4, 12.1.3-h3; 11.2.0 before 11.2.10-h2, 11.2.7-h8, 11.2.4-h15; 11.1.0 before 11.1.13, 11.1.10-h9, 11.1.6-h23, 11.1.4-h27; 10.2.0 before 10.2.18-h1, 10.2.16-h6, 10.2.13-h18, 10.2.10-h30, 10.2.7-h32; 10.1.0 before 10.1.14-h20 · source: vendor, NVD
PA
Prisma Access · Palo Alto Networks
11.2 before 11.2.7-h8; 10.2 before 10.2.10-h29, 10.2.4-h43 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-0227
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-0227
Vendor Advisory
https://security.paloaltonetworks.com/CVE-2026-0227
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