CVE-2026-0227: PAN-OS: Firewall Denial of Service (DoS) in GlobalProtect Gateway and Portal

Published Jan 14, 2026
·
Updated

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.

Affected Software

143 affected componentsFixes available
Palo Alto Networks PAN-OS>=10.1.0<10.1.14
Palo Alto Networks PAN-OS>=10.2.0<10.2.7
Palo Alto Networks PAN-OS>=10.2.8<10.2.10
Palo Alto Networks PAN-OS>=10.2.11<10.2.13
Palo Alto Networks PAN-OS>=10.2.14<10.2.16
Palo Alto Networks PAN-OS>=11.1.0<11.1.4
Palo Alto Networks PAN-OS>=11.1.5<11.1.6
Palo Alto Networks PAN-OS>=11.1.7<11.1.10
Palo Alto Networks PAN-OS>=11.1.11<11.1.13
Palo Alto Networks PAN-OS>=11.2.0<11.2.4
Palo Alto Networks PAN-OS>=11.2.5<11.2.7
Palo Alto Networks PAN-OS>=11.2.8<11.2.10
Palo Alto Networks PAN-OS=10.1.14
Palo Alto Networks PAN-OS=10.1.14-h10
Palo Alto Networks PAN-OS=10.1.14-h11
Palo Alto Networks PAN-OS=10.1.14-h13
Palo Alto Networks PAN-OS=10.1.14-h14
Palo Alto Networks PAN-OS=10.1.14-h15
Palo Alto Networks PAN-OS=10.1.14-h16
Palo Alto Networks PAN-OS=10.1.14-h19
Palo Alto Networks PAN-OS=10.1.14-h2
Palo Alto Networks PAN-OS=10.1.14-h4
Palo Alto Networks PAN-OS=10.1.14-h6
Palo Alto Networks PAN-OS=10.1.14-h8
Palo Alto Networks PAN-OS=10.1.14-h9
Palo Alto Networks PAN-OS=10.2.7
Palo Alto Networks PAN-OS=10.2.7-h1
Palo Alto Networks PAN-OS=10.2.7-h12
Palo Alto Networks PAN-OS=10.2.7-h16
Palo Alto Networks PAN-OS=10.2.7-h18
Palo Alto Networks PAN-OS=10.2.7-h19
Palo Alto Networks PAN-OS=10.2.7-h21
Palo Alto Networks PAN-OS=10.2.7-h24
Palo Alto Networks PAN-OS=10.2.7-h3
Palo Alto Networks PAN-OS=10.2.7-h6
Palo Alto Networks PAN-OS=10.2.7-h8
Palo Alto Networks PAN-OS=10.2.10
Palo Alto Networks PAN-OS=10.2.10-h10
Palo Alto Networks PAN-OS=10.2.10-h12
Palo Alto Networks PAN-OS=10.2.10-h14
Palo Alto Networks PAN-OS=10.2.10-h17
Palo Alto Networks PAN-OS=10.2.10-h18
Palo Alto Networks PAN-OS=10.2.10-h2
Palo Alto Networks PAN-OS=10.2.10-h21
Palo Alto Networks PAN-OS=10.2.10-h27
Palo Alto Networks PAN-OS=10.2.10-h3
Palo Alto Networks PAN-OS=10.2.10-h4
Palo Alto Networks PAN-OS=10.2.10-h5
Palo Alto Networks PAN-OS=10.2.10-h7
Palo Alto Networks PAN-OS=10.2.10-h9
Palo Alto Networks PAN-OS=10.2.13
Palo Alto Networks PAN-OS=10.2.13-h1
Palo Alto Networks PAN-OS=10.2.13-h10
Palo Alto Networks PAN-OS=10.2.13-h16
Palo Alto Networks PAN-OS=10.2.13-h2
Palo Alto Networks PAN-OS=10.2.13-h3
Palo Alto Networks PAN-OS=10.2.13-h4
Palo Alto Networks PAN-OS=10.2.13-h5
Palo Alto Networks PAN-OS=10.2.13-h7
Palo Alto Networks PAN-OS=10.2.16
Palo Alto Networks PAN-OS=10.2.16-h1
Palo Alto Networks PAN-OS=10.2.16-h4
Palo Alto Networks PAN-OS=10.2.17
Palo Alto Networks PAN-OS=10.2.18
Palo Alto Networks PAN-OS=11.1.4
Palo Alto Networks PAN-OS=11.1.4-h1
Palo Alto Networks PAN-OS=11.1.4-h13
Palo Alto Networks PAN-OS=11.1.4-h15
Palo Alto Networks PAN-OS=11.1.4-h16
Palo Alto Networks PAN-OS=11.1.4-h17
Palo Alto Networks PAN-OS=11.1.4-h18
Palo Alto Networks PAN-OS=11.1.4-h25
Palo Alto Networks PAN-OS=11.1.4-h4
Palo Alto Networks PAN-OS=11.1.4-h7
Palo Alto Networks PAN-OS=11.1.4-h9
Palo Alto Networks PAN-OS=11.1.6
Palo Alto Networks PAN-OS=11.1.6-h1
Palo Alto Networks PAN-OS=11.1.6-h10
Palo Alto Networks PAN-OS=11.1.6-h14
Palo Alto Networks PAN-OS=11.1.6-h17
Palo Alto Networks PAN-OS=11.1.6-h19
Palo Alto Networks PAN-OS=11.1.6-h20
Palo Alto Networks PAN-OS=11.1.6-h21
Palo Alto Networks PAN-OS=11.1.6-h22
Palo Alto Networks PAN-OS=11.1.6-h3
Palo Alto Networks PAN-OS=11.1.6-h4
Palo Alto Networks PAN-OS=11.1.6-h5
Palo Alto Networks PAN-OS=11.1.6-h6
Palo Alto Networks PAN-OS=11.1.6-h7
Palo Alto Networks PAN-OS=11.1.10
Palo Alto Networks PAN-OS=11.1.10-h1
Palo Alto Networks PAN-OS=11.1.10-h4
Palo Alto Networks PAN-OS=11.1.10-h5
Palo Alto Networks PAN-OS=11.1.10-h7
Palo Alto Networks PAN-OS=11.2.4
Palo Alto Networks PAN-OS=11.2.4-h1
Palo Alto Networks PAN-OS=11.2.4-h10
Palo Alto Networks PAN-OS=11.2.4-h11
Palo Alto Networks PAN-OS=11.2.4-h12
Palo Alto Networks PAN-OS=11.2.4-h14
Palo Alto Networks PAN-OS=11.2.4-h2
Palo Alto Networks PAN-OS=11.2.4-h4
Palo Alto Networks PAN-OS=11.2.4-h5
Palo Alto Networks PAN-OS=11.2.4-h6
Palo Alto Networks PAN-OS=11.2.4-h7
Palo Alto Networks PAN-OS=11.2.4-h8
Palo Alto Networks PAN-OS=11.2.4-h9
Palo Alto Networks PAN-OS=11.2.7
Palo Alto Networks PAN-OS=11.2.7-h1
Palo Alto Networks PAN-OS=11.2.7-h2
Palo Alto Networks PAN-OS=11.2.7-h3
Palo Alto Networks PAN-OS=11.2.7-h4
Palo Alto Networks PAN-OS=11.2.7-h7
Palo Alto Networks PAN-OS=11.2.10
Palo Alto Networks PAN-OS=11.2.10-h1
Palo Alto Networks PAN-OS=12.1.2
Palo Alto Networks PAN-OS=12.1.3
Palo Alto Networks PAN-OS=12.1.3-h1
All of the following
Palo Alto Networks Prisma Access
Any of the following
Palo Alto Networks PAN-OS>=10.2.0<10.2.10
Palo Alto Networks PAN-OS>=11.2.0<11.2.7
Palo Alto Networks PAN-OS=10.2.10-h10
Palo Alto Networks PAN-OS=10.2.10-h12
Palo Alto Networks PAN-OS=10.2.10-h14
Palo Alto Networks PAN-OS=10.2.10-h17
Palo Alto Networks PAN-OS=10.2.10-h18
Palo Alto Networks PAN-OS=10.2.10-h2
Palo Alto Networks PAN-OS=10.2.10-h21
Palo Alto Networks PAN-OS=10.2.10-h27
Palo Alto Networks PAN-OS=10.2.10-h3
Palo Alto Networks PAN-OS=10.2.10-h4
Palo Alto Networks PAN-OS=10.2.10-h5
Palo Alto Networks PAN-OS=10.2.10-h7
Palo Alto Networks PAN-OS=10.2.10-h9
Palo Alto Networks PAN-OS=11.2.7
Palo Alto Networks PAN-OS=11.2.7-h1
Palo Alto Networks PAN-OS=11.2.7-h2
Palo Alto Networks PAN-OS=11.2.7-h3
Palo Alto Networks PAN-OS=11.2.7-h4
Palo Alto Networks PAN-OS=11.2.7-h7
Palo Alto Networks Cloud NGFW
Palo Alto Networks PAN-OS=12.1.0, =11.2.0, =11.1.0, =10.2.0, =10.1.0
12.1.412.1.3-h311.2.10-h211.2.7-h811.2.4-h1511.1.1311.1.10-h911.1.6-h2311.1.4-h2710.2.18-h110.2.16-h610.2.13-h1810.2.10-h3110.2.7-h3210.1.14-h20
Palo Alto Networks Prisma Access=11.2, =10.2
11.2.7-h810.2.10-h2910.2.4-h43

Remediation

Mitigation

No known workarounds exist for this issue.

Information

VERSION MINOR VERSION SUGGESTED SOLUTION Cloud NGFW All No action needed. PAN-OS 12.1 12.1.2 through 12.1.3 Upgrade to 12.1.4 or later. PAN-OS 11.2 11.2.8 through 11.2.10 Upgrade to 11.2.10-h2 or later. 11.2.5 through 11.2.7 Upgrade to 11.2.7-h8 or 11.2.10-h2 or later. 11.2.0 through 11.2.4 Upgrade to 11.2.4-h15 or 11.2.10-h2 or later. PAN-OS 11.1 11.1.11 through 11.1.12 Upgrade to 11.1.13 or later. 11.1.7 through 11.1.10 Upgrade to 11.1.10-h9 or 11.1.13 later. 11.1.5 through 11.1.6 Upgrade to 11.1.6-h23 or 11.1.13 or later. 11.1.0 through 11.1.4 Upgrade to 11.1.4-h27 or 11.1.13 or later. PAN-OS 10.2 10.2.17 through 10.2.18 Upgrade to 10.2.18-h1 or later. 10.2.14 through 10.2.16 Upgrade to 10.2.16-h6 or 10.2.18-h1 or later. 10.2.11 through 10.2.13 Upgrade to 10.2.13-h18 or 10.2.18-h1 or later. 10.2.8 through 10.2.10 Upgrade to 10.2.10-h31 or 10.2.18-h1 or later. 10.2.0 through 10.2.7 Upgrade to 10.2.7-h32 or 10.2.18-h1 or later.  PAN-OS 10.1  10.1.0 through 10.1.14 Upgrade to 10.1.14-h20 or later.  All older   Upgrade to a supported fixed version. unsupported PAN-OS versions Prisma Access 11.2 11.2.0 through 11.2.7 Upgrade to 11.2.7-h8 or later.* Prisma Access 10.2 10.2.0 through 10.2.10 Upgrade to 10.2.10-h29 or later.* * See the note under Product Status for information regarding Prisma Access upgrades.

Event History

Jan 14, 2026
Advisory Published
via Palo Alto Networks·05:00 PM
Data Sourced
via Palo Alto Networks·05:00 PM
RemedyDescriptionSeverityWeaknessAffected Software
Jan 15, 2026
News Published
via BleepingComputer·09:02 AM
News Published
via BleepingComputer·09:04 AM
CVE Published
via MITRE·06:45 PM
Data Sourced
via MITRE·06:45 PM
DescriptionWeakness
Data Sourced
via NVD·07:16 PM
DescriptionSeverityWeaknessAffected Software
Feb 9, 2026
Advisory Published
via Palo Alto Networks·05:30 PM
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Frequently Asked Questions

1

What is the severity of CVE-2026-0227?

The severity of CVE-2026-0227 is classified as HIGH.

2

How do I fix CVE-2026-0227?

To fix CVE-2026-0227, upgrade to the latest patched version of PAN-OS, Prisma Access, or Cloud NGFW as specified by Palo Alto Networks.

3

What impact does CVE-2026-0227 have on my system?

CVE-2026-0227 can lead to a denial of service (DoS) on the firewall, potentially affecting network availability.

4

Who is affected by CVE-2026-0227?

Organizations using affected versions of Palo Alto Networks PAN-OS, Prisma Access, or Cloud NGFW are at risk from CVE-2026-0227.

5

Is CVE-2026-0227 remotely exploitable?

Yes, CVE-2026-0227 can be exploited by unauthenticated remote attackers.

Company

Resources

Contact

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