CVE-2021-3056 - CVE House
Back to Database
Status published High CVE-2021-3056

PAN-OS: Memory Corruption Vulnerability in GlobalProtect Clientless VPN During SAML Authentication

Vulnerability Description

A memory corruption vulnerability in Palo Alto Networks PAN-OS GlobalProtect Clientless VPN enables an authenticated attacker to execute arbitrary code with root user privileges during SAML authentication. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.20; PAN-OS 9.0 versions earlier than PAN-OS 9.0.14; PAN-OS 9.1 versions earlier than PAN-OS 9.1.9; PAN-OS 10.0 versions earlier than PAN-OS 10.0.1. Prisma Access customers with Prisma Access 2.1 Preferred firewalls are impacted by this issue.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-3056

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • This issue was found by Nicholas Newsom of Palo Alto Networks during an internal security review.

References

More from Palo Alto Networks

View All →
CVE-2025-4619
PAN-OS: Firewall Denial of Service (DoS) Using Specially Crafted Packets
Medium 6.6
CVE-2025-4618
Prisma Browser: Sensitive Information Disclosure Vulnerability in Prisma Browser
Medium 4.4
CVE-2025-4617
Prisma Browser: Insufficient Policy Enforcement Vulnerability in Prisma Browser
Low 1.1
CVE-2025-4616
Prisma Browser: Insufficient Validation of Untrusted Input Vulnerability in Prisma Browser
Low 1.1
CVE-2025-4615
PAN-OS: Improper Neutralization of Input in the Management Web Interface
Medium 5.5

Affected Vendor

Palo Alto Networks

View all reports →

Affected Software

PAN-OS, Prisma Access
Vulnerable Versions:
10.1.*, 9.0, 8.1, 9.1, 10.0, 2.2 all, 2.1 Preferred, 2.1 Innovation

Timeline

Official Publish: November 10th, 2021
Last Modified: September 16th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-120

MITRE ATT&CK TTPs

T1203 Exploitation for Client Execution
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1055 Process Injection
Defense Evasion
T1105 Ingress Tool Transfer
Command and Control