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Vulnerability record · CVE-2021-3064 · published 10 November 2021

CVE-2021-3064: Paloaltonetworks pan-os stack-based buffer overflow vulnerability

Paloaltonetworks · Pan Os

A memory corruption vulnerability exists in Palo Alto Networks GlobalProtect portal and gateway interfaces that enables an unauthenticated network-based attacker to disrupt system processes and potentially execute arbitrary code with root privileges. The attacker must have network access to the GlobalProtect interface to exploit this issue. This issue impacts PAN-OS 8.1 versions earlier than PAN-OS 8.1.17. Prisma Access customers are not impacted by this issue.

9.8 CVSS 3.1 Critical EPSS 20% · top 2.6% CWE-121 · Stack-based buffer overflowCWE-787 · Out-of-bounds write
9.8CVSS 3.1 base score, v2 10.0
20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A memory corruption vulnerability exists in Palo Alto Networks GlobalProtect portal and gateway interfaces that enables an unauthenticated network-based attacker to disrupt system processes and potentially execute arbitrary code with root privileges. The attacker must have network access to the GlobalProtect interface to exploit this issue. This issue impacts PAN-OS 8.1 versions earlier than PAN-OS 8.1.17. Prisma Access customers are not impacted by this issue.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://security.paloaltonetworks.com/CVE-2021-3064 Vendor Advisory
https://security.paloaltonetworks.com/CVE-2021-3064 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2024-3400PAN-OS GlobalProtect command injection allows unauthenticated root code executionA command injection caused by arbitrary file creation in the GlobalProtect feature of Palo Alto Networks PAN-OS lets an unauthenticated attacker run …KEVEPSS 100%analysed10.0CVE-2020-2021PAN-OS SAML signature verification bypass allows authentication bypassPAN-OS fails to properly verify SAML signatures when SAML authentication is enabled and the 'Validate Identity Provider Certificate' option is unchec…KEVEPSS 4.4%analysed9.8CVE-2017-15944PAN-OS management interface input validation flaw allows remote code executionPAN-OS versions before 6.1.19, 7.0.x before 7.0.19, 7.1.x before 7.1.14, and 8.0.x before 8.0.6 contain an input validation and memory buffer overflo…KEVEPSS 98%analysed9.3CVE-2026-0300PAN-OS User-ID Authentication Portal buffer overflow allows root code executionA buffer overflow (out-of-bounds write, CWE-787) in the User-ID Authentication Portal (Captive Portal) service of Palo Alto Networks PAN-OS lets an u…KEVEPSS 32%analysed9.3CVE-2024-0012PAN-OS Management Web Interface Authentication BypassPAN-OS contains a missing authentication flaw (CWE-306) in the management web interface that lets an unauthenticated network attacker obtain PAN-OS a…KEVEPSS 100%analysed8.8CVE-2025-0108PAN-OS management web interface authentication bypassPAN-OS contains a missing-authentication flaw (CWE-306) in the management web interface that lets an unauthenticated attacker with network access inv…KEVEPSS 98%analysed8.7CVE-2024-3393PAN-OS DNS Security packet causes firewall reboot and maintenance modeA denial of service flaw in the DNS Security feature of Palo Alto Networks PAN-OS lets an unauthenticated attacker send a crafted packet through the …KEVEPSS 28%analysed8.6CVE-2022-0028PAN-OS URL filtering misconfiguration enables reflected TCP DoSA PAN-OS URL filtering policy misconfiguration allows a network-based attacker to use PA-Series, VM-Series and CN-Series firewalls to conduct reflect…KEVEPSS 2.4%analysed

Source: NIST National Vulnerability Database (record CVE-2021-3064), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.