CVE-2020-2031

What it is

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.

At a glance

Exploitability

Can be exploited over the network with an admin-level account. High risk of service disruption.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-07-08 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:11 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 4.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-07-08 17:15 UTC

Last modified

2026-06-17 03:11 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-191

Record status

Modified

Affected

• Paloaltonetworks pan-os < 9.1.3

Attack profile CVSS 3.1 · 4.9

Attack vector

Network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-2031.md and follow it. Check whether this project is affected by CVE-2020-2031. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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