Palo Alto Networks PAN-OS 9.1.x < 9.1.3 Integer Underflow Vulnerability

medium Nessus Plugin ID 138221


The remote PAN-OS host is affected by a vulnerability


The version of Palo Alto Networks PAN-OS running on the remote host is 9.1.x prior to 9.1.3. It is, therefore, affected by an integer underflow vulnerability in the dnsproxyd component of the PAN-OS management interface. This 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.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.


Upgrade to PAN-OS 9.1.3 or later

See Also

Plugin Details

Severity: Medium

ID: 138221

File Name: palo_alto_CVE-2020-2031.nasl

Version: 1.4

Type: combined

Published: 7/9/2020

Updated: 10/13/2020

Supported Sensors: Nessus

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:L/Au:S/C:N/I:N/A:C

CVSS Score Source: CVE-2020-2031


Risk Factor: Medium

Base Score: 4.9

Temporal Score: 4.3

Vector: CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:paloaltonetworks:pan-os

Required KB Items: Host/Palo_Alto/Firewall/Version, Host/Palo_Alto/Firewall/Full_Version, Host/Palo_Alto/Firewall/Source

Exploit Ease: No known exploits are available

Patch Publication Date: 7/8/2020

Vulnerability Publication Date: 7/8/2020

Reference Information

CVE: CVE-2020-2031

CWE: 191

IAVA: 2020-A-0282-S