CVE-2020-2031 - CVE House
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Status published Medium CVE-2020-2031

PAN-OS: Integer underflow in the management interface

Vulnerability Description

An integer underflow vulnerability in the dnsproxyd component of the PAN-OS management interface allows authenticated administrators to issue a command from the command line interface that causes the component to stop responding. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode. This issue impacts: PAN-OS 9.1 versions earlier than PAN-OS 9.1.3. This issue does not impact PAN-OS 8.1, PAN-OS 9.0, or Prisma Access services.

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 discovered by Jin Chen of Palo Alto Networks during internal security review.

References

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CVE-2025-4617
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CVE-2025-4616
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Affected Vendor

Palo Alto Networks

View all reports →

Affected Software

PAN-OS
Vulnerable Versions:
9.0.*, 8.1.*, 9.1

Timeline

Official Publish: July 8th, 2020
Last Modified: September 16th, 2024
Added to House: July 21st, 2026

CVSS Vectors

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

Weaknesses (CWE)

CWE-191

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1574 Hijack Execution Flow
Privilege Escalation
T1059 Command and Scripting Interpreter
Execution
T1485 Data Destruction
Impact
T1499 Endpoint Denial of Service
Impact