CVE-2021-3063

PAN-OS: Denial-of-Service (DoS) Vulnerability in GlobalProtect Portal and Gateway Interfaces

HIGH
7.5
CVSS Score
Published: November 10, 2021 at 05:10 PM UTC
Updated: June 17, 2026 at 04:04 AM UTC
1 product affected across 1 vendorPAN-OS

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%

Description

An improper handling of exceptional conditions vulnerability exists in Palo Alto Networks GlobalProtect portal and gateway interfaces that enables an unauthenticated network-based attacker to send specifically crafted traffic to a GlobalProtect interface that causes the service to stop responding. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.21; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14-h4; PAN-OS 9.1 versions earlier than PAN-OS 9.1.11-h3; PAN-OS 10.0 versions earlier than PAN-OS 10.0.8-h4; PAN-OS 10.1 versions earlier than PAN-OS 10.1.3. Prisma Access customers are not impacted by this issue.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

10.0 ≤ v < 10.0.8-h410.0.0 ≤ v ≤ 10.0.810.1 ≤ v < 10.1.310.1.0 ≤ v < 10.1.38.1 ≤ v < 8.1.218.1.0 ≤ v < 8.1.219.0 ≤ v < 9.0.14-h49.0.0 ≤ v ≤ 9.0.149.1 ≤ v < 9.1.11-h39.1.0 ≤ v ≤ 9.1.1110.010.18.19.09.1
Affected range stops below 10.0.8-h4, so it looks safe — our inference, not a vendor statement
Affected range stops below 10.1.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.1.21, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.0.14-h4, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.1.11-h3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (1)

CVSS

7.5HIGHpalo_alto
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-755

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