CVE-2021-3056

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

HIGH

8.8

CVSS Score

Published: November 10, 2021 at 05:10 PM UTC

Updated: June 17, 2026 at 04:04 AM UTC

2 products affected across 1 vendorPAN-OSPrisma Access

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Severity

HIGH8.8

Exploit prediction

EPSS 2%

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.

Affected

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

PAN-OS · Palo Alto Networks

95%

10.0 ≤ v < 10.0.18.1 ≤ v < 8.1.208.1.0 ≤ v < 8.1.209.0 ≤ v < 9.0.149.0.0 ≤ v < 9.0.149.1 ≤ v < 9.1.99.1.0 ≤ v < 9.1.910.0 10.0.0 8.1 9.0 9.1

Affected range stops below 10.0.1, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 10.1.* (unaffected)

Affected range stops below 8.1.20, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.14, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.1.9, so it looks safe — our inference, not a vendor statement

Prisma Access · Palo Alto Networks

60%

2.1 Preferred

Vendor states this is fixed in 2.1 Innovation (unaffected)

Vendor states this is fixed in 2.2 all (unaffected)

Remediation

No guide yet

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

Patch and advisory references

https://security.paloaltonetworks.com/CVE-2021-3056

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://security.paloaltonetworks.com/CVE-2021-3056

CVSS

8.8HIGHpalo_alto

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-120CWE-787

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