CVE-2021-3056

Name: CVE-2021-3056
Creator: NVD / NIST
Published: 2021-11-10T17:15:09.553+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.49%

Last modified Jun 17, 2026

CVE-2021-3056 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 1.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

1.49%

70.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Paloaltonetworks	Pan-Os	>= 8.1.0, < 8.1.20
Paloaltonetworks	Pan-Os	>= 9.0.0, < 9.0.14
Paloaltonetworks	Pan-Os	>= 9.1.0, < 9.1.9
Paloaltonetworks	Pan-Os	10.0.0

References

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

Timeline

Published: Nov 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3056?

How severe is CVE-2021-3056?

CVE-2021-3056 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.49% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3056?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-3056?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST