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High

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

CVE-2026-0227 · PAN-OS · CVSS 7.5

In brief

Severity · CVSS
High7.5CVSS 3.1, High
EPSS
0.75%
CISA KEV
Not listed
Products
PAN-OS
Published · Modified
·
Last verified

Summary

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.

Weakness: CWE-754

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

7 branches with a published fixed release

Palo Alto Networks PAN-OS

Source: CVE-2026-0227

  1. 12.1
    Affected versions>= 12.1.2, < 12.1.3-h3
    First fixed release12.1.3-h312.1.4
  2. 11.2Approaching end of support
    Affected versions>= 11.2.0, < 11.2.4-h15>= 11.2.5, < 11.2.7-h8>= 11.2.8, < 11.2.10-h2
    First fixed release11.2.4-h1511.2.7-h811.2.10-h2
  3. 11.1Approaching end of support
    Affected versions>= 11.1.0, < 11.1.4-h27>= 11.1.5, < 11.1.6-h23>= 11.1.7, < 11.1.10-h9>= 11.1.11, < 11.1.13
    First fixed release11.1.4-h2711.1.6-h2311.1.10-h911.1.13
  4. 10.2End of life
    Affected versions>= 10.2.0, < 10.2.7-h32>= 10.2.8, < 10.2.10-h30>= 10.2.11, < 10.2.13-h18>= 10.2.14, < 10.2.16-h6>= 10.2.17, < 10.2.18-h1
    First fixed release10.2.7-h3210.2.10-h3010.2.13-h1810.2.16-h610.2.18-h1
  5. 10.1End of life
    Affected versions>= 10.1.0, < 10.1.14-h20
    First fixed release10.1.14-h20

Palo Alto Networks Prisma Access

Source: CVE-2026-0227

  1. 11.2
    Affected versions>= 11.2.0, < 11.2.7-h8
    First fixed release11.2.7-h8
  2. 10.2
    Affected versions>= 10.2.0, < 10.2.4-h43>= 10.2.5, < 10.2.10-h29
    First fixed release10.2.4-h4310.2.10-h29

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • PAN-OS 12.112.1.3-h3, 12.1.4
  • PAN-OS 11.211.2.4-h15, 11.2.7-h8, 11.2.10-h2
  • PAN-OS 11.111.1.4-h27, 11.1.6-h23, 11.1.10-h9, 11.1.13
  • PAN-OS 10.210.2.7-h32, 10.2.10-h30, 10.2.13-h18, 10.2.16-h6, 10.2.18-h1
  • PAN-OS 10.110.1.14-h20
  • Prisma Access 11.211.2.7-h8
  • Prisma Access 10.210.2.4-h43, 10.2.10-h29

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

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.

Full text

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-h30 or 10.2.18-h1 or later. 10.2.0 through 10.2.7 Up…

SourcePalo Alto Networks (CVE record)

Workarounds (vendor)

No known workarounds exist for this issue.

SourcePalo Alto Networks (CVE record)

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0049

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Not listed in CISA KEV as of the last check.

0.75% probability of exploitation in the next 30 days (percentile 53%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0049Published 15 Jan 2026

Multiple vulnerabilities in Palo Alto Networks products

Remote denial of serviceNot specified by the vendorSecurity policy bypassPrivilege escalation

Summary

Multiple vulnerabilities have been discovered in Palo Alto Networks products. Some of them allow an attacker to cause privilege escalation, remote denial of service, and security policy bypass. Palo Alto Networks is aware of a proof of concept for the vulnerability CVE-2026-0227.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:04 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Source record last modified
  3. EPSS score computed
  4. Last verified by Patcharo

Official sources

Vendor advisory

Palo Alto Networks · NVD · FIRST EPSS

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: PAN-OS versions explained: release lines, maintenance releases and the -h1, -h2, -h3 suffixes

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-0301PAN-OS: Information Disclosure Vulnerability in URL FilteringHigh
  • CVE-2026-0280PAN-OS: IPv6 Firewall Policy BypassHigh
  • CVE-2026-0281PAN-OS: Information Disclosure Vulnerability in Management Web InterfaceHigh
  • CVE-2026-0283PAN-OS: Authentication Bypass Vulnerability in Large Scale VPN (LSVPN)High
  • CVE-2026-0284PAN-OS: XML Injection Vulnerability in Large Scale VPN (LSVPN)Critical

All PAN-OS vulnerabilitiesAll Palo Alto Networks vulnerabilities