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

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.

Published: 2026-01-15 Last update: 2026-02-06 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-0227 is rated Low Risk (33.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.07%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-0227

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-17 0.03% 0.07% +0.03%
2 2026-02-18 0.07% 0.03% -0.04%
3 2026-01-16 — 0.07% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-0227

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.6 4.0 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:U/V:D/RE:M/U:Amber Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network.
Attack complexity (AC:L)
Exploitation conditions are straightforward and stable.
Attack requirements (AT:N)
No additional preconditions are required beyond normal reachability.
Privileges required (PR:N)
No privileges are required.
User interaction (UI:N)
No user interaction is required.
Vulnerable system confidentiality impact (VC:N)
No confidentiality impact on the vulnerable system.
Vulnerable system integrity impact (VI:N)
No integrity impact on the vulnerable system.
Vulnerable system availability impact (VA:H)
High availability impact on the vulnerable system.
Subsequent system confidentiality impact (SC:N)
No confidentiality impact on subsequent systems.
Subsequent system integrity impact (SI:N)
No integrity impact on subsequent systems.
Subsequent system availability impact (SA:N)
No availability impact on subsequent systems.
Exploit maturity (threat) (E:U)
Unreported: no public PoC, no reported exploitation, and no known simplification tools.
Confidentiality requirement (CR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Integrity requirement (IR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Availability requirement (AR:X)
Not defined: insufficient information; scoring treats this like High (worst case).
Modified attack vector (MAV:X)
Not defined: scoring uses the Base Attack Vector (AV).
Modified attack complexity (MAC:X)
Not defined: scoring uses the Base Attack Complexity (AC).
Modified attack requirements (MAT:X)
Not defined: scoring uses the Base Attack Requirements (AT).
Modified privileges required (MPR:X)
Not defined: scoring uses the Base Privileges Required (PR).
Modified user interaction (MUI:X)
Not defined: scoring uses the Base User Interaction (UI).
Modified vulnerable system confidentiality impact (MVC:X)
Not defined: scoring uses the Base VC metric.
Modified vulnerable system integrity impact (MVI:X)
Not defined: scoring uses the Base VI metric.
Modified vulnerable system availability impact (MVA:X)
Not defined: scoring uses the Base VA metric.
Modified subsequent system confidentiality impact (MSC:X)
Not defined: scoring uses the Base SC metric.
Modified subsequent system integrity impact (MSI:X)
Not defined: scoring uses the Base SI metric.
Modified subsequent system availability impact (MSA:X)
Not defined: scoring uses the Base SA metric.
Safety (supplemental) (S:X)
Not evaluated.
Automatable (supplemental) (AU:Y)
Yes: all four kill-chain steps (reconnaissance, weaponization, delivery, exploitation) can be automated.
Recovery (supplemental) (R:U)
User: manual user intervention is needed to recover services.
Value density (supplemental) (V:D)
Diffuse: a single exploit event controls relatively limited resources (e.g., one client).
Vulnerability response effort (supplemental) (RE:M)
Moderate effort (remote update, disable subsystem, simple upgrade with minor service impact).
Provider urgency (supplemental) (U:AMBER)
Amber: provider rates moderate urgency.
 — — [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-0227

Affected software / configurations for CVE-2026-0227

Vendor Product Version Raw CPE
paloaltonetworks pan-os >= 10.1.0, < 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 10.2.0, < 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 10.2.8, < 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 10.2.11, < 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 10.2.14, < 10.2.16 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.1.0, < 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.1.5, < 11.1.6 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.1.7, < 11.1.10 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.1.11, < 11.1.13 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.2.0, < 11.2.4 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.2.5, < 11.2.7 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os >= 11.2.8, < 11.2.10 cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h10:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h11:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h13:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h14:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h15:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h16:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h19:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h6:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h8:*:*:*:*:*:*
paloaltonetworks pan-os 10.1.14 cpe:2.3:o:paloaltonetworks:pan-os:10.1.14:h9:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h1:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h12:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h16:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h18:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h19:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h21:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h24:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h6:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.7 cpe:2.3:o:paloaltonetworks:pan-os:10.2.7:h8:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h10:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h12:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h14:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h17:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h18:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h21:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h27:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h5:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h7:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.10 cpe:2.3:o:paloaltonetworks:pan-os:10.2.10:h9:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h1:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h10:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h16:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h2:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h3:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h5:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.13 cpe:2.3:o:paloaltonetworks:pan-os:10.2.13:h7:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.16 cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.16 cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h1:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.16 cpe:2.3:o:paloaltonetworks:pan-os:10.2.16:h4:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.17 cpe:2.3:o:paloaltonetworks:pan-os:10.2.17:-:*:*:*:*:*:*
paloaltonetworks pan-os 10.2.18 cpe:2.3:o:paloaltonetworks:pan-os:10.2.18:-:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:-:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h1:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h13:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h15:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h16:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h17:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h18:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h25:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h4:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h7:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.4 cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h9:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.6 cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:-:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.6 cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h1:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.6 cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h10:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.6 cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h14:*:*:*:*:*:*
paloaltonetworks pan-os 11.1.6 cpe:2.3:o:paloaltonetworks:pan-os:11.1.6:h17:*:*:*:*:*:*

References for CVE-2026-0227

cvelogic Threat Intelligence