CVE-2021-3063: high-severity vulnerability in Palo Alto Networks PAN-OS
PAN-OS: Denial-of-Service (DoS) Vulnerability in GlobalProtect Portal and Gateway Interfaces
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.9%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Related CVEs — Palo Alto Networks PAN-OS
In the same product, most dangerous first.
CVE-2024-3400CRITICALPAN-OS: Arbitrary File Creation Leads to OS Command Injection Vulnerability in GlobalProtectEPSS 100.0%KEVCVE-2024-0012CRITICALPAN-OS: Authentication Bypass in the Management Web Interface (PAN-SA-2024-0015)EPSS 99.8%KEVCVE-2025-0108HIGHPAN-OS: Authentication Bypass in the Management Web InterfaceEPSS 98.5%KEVCVE-2026-0257HIGHPAN-OS: GlobalProtect Authentication Bypass VulnerabilitiesEPSS 95.6%KEVCVE-2024-9474MEDIUMPAN-OS: Privilege Escalation (PE) Vulnerability in the Web Management InterfaceEPSS 93.8%KEVCVE-2026-0300CRITICALPAN-OS: Unauthenticated user initiated Buffer Overflow Vulnerability in User-ID™ Authentication PortalEPSS 41.7%KEV