CVE-2020-2040 - CVE House

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Status published Critical CVE-2020-2040

PAN-OS: Buffer overflow when Captive Portal or Multi-Factor Authentication (MFA) is enabled

9.8 CVSS

Vulnerability Description

A buffer overflow vulnerability in PAN-OS allows an unauthenticated attacker to disrupt system processes and potentially execute arbitrary code with root privileges by sending a malicious request to the Captive Portal or Multi-Factor Authentication interface. This issue impacts: All versions of PAN-OS 8.0; PAN-OS 8.1 versions earlier than PAN-OS 8.1.15; PAN-OS 9.0 versions earlier than PAN-OS 9.0.9; PAN-OS 9.1 versions earlier than PAN-OS 9.1.3.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

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

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Credits & Attribution

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

This issue was found by Yamata Li of Palo Alto Networks during internal security review.

References

https://security.paloaltonetworks.com/CVE-2020-2040

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Affected Vendor

Palo Alto Networks

View all reports →

Affected Software

PAN-OS

Vulnerable Versions:

8.0.*, 9.0, 9.1, 8.1, 10.0.0

Timeline

Official Publish: September 9th, 2020

Last Modified: September 16th, 2024

Added to House: July 21st, 2026

CVSS Vectors

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

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1203 Exploitation for Client Execution

T1068 Exploitation for Privilege Escalation

Privilege Escalation

T1055 Process Injection

Defense Evasion

T1105 Ingress Tool Transfer

Command and Control