CVE-2022-0023

Description

An improper handling of exceptional conditions vulnerability exists in the DNS proxy feature of Palo Alto Networks PAN-OS software that enables a meddler-in-the-middle (MITM) to send specifically crafted traffic to the firewall that causes the service to restart unexpectedly. Repeated attempts to send this request result in denial-of-service to all PAN-OS services by restarting the device in maintenance mode.

Description (MITRE) cveawg.mitre.org

Pulled from cveawg.mitre.org/api/cve/CVE-2022-0023 on 2026-07-17. Shown when MITRE's text differs from the cvelistV5 mirror.

An improper handling of exceptional conditions vulnerability exists in the DNS proxy feature of Palo Alto Networks PAN-OS software that enables a meddler-in-the-middle (MITM) to send specifically crafted traffic to the firewall that causes the service to restart unexpectedly. Repeated attempts to send this request result in denial-of-service to all PAN-OS services by restarting the device in maintenance mode. This issue does not impact Panorama appliances and Prisma Access customers. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.22; PAN-OS 9.0 versions earlier than PAN-OS 9.0.16; PAN-OS 9.1 versions earlier than PAN-OS 9.1.13; PAN-OS 10.0 versions earlier than PAN-OS 10.0.10; PAN-OS 10.1 versions earlier than PAN-OS 10.1.5. This issue does not impact PAN-OS 10.2.

Overview

State

—

Assigner (CNA)

—

CVSS severity

MEDIUM

CVSS score

5.0 / 10

CVSS vector

AV:N/AC:M/Au:N/C:N/I:N/A:P

Effective score

5.0 / 10 MEDIUM source: CNA overview

CWE(s)

—

Reserved

—

Published

2022-04-13 00:00 UTC

Last updated

—

Source

https://www.rapid7.com/db/vulnerabilities/palo-alto-networks-pan-os-cve-2022-0023/

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published

2022-04-13 19:15:09 UTC

NVD last modified

2026-06-17 04:19:54 UTC

NVD CVSS v3.1

5.9 / 10 MEDIUM source: psirt@paloaltonetworks.com

NVD CVSS vector

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

Exploitability subscore

2.2 / 10

Impact subscore

3.6 / 10

EPSS score

0.0070 (probability of exploitation in next 30 days)

EPSS percentile

49.17% vs all CVEs — higher = more likely to be exploited, as of 2026-07-17

NVD-assigned CWE(s): CWE-755 (differs from the CNA list above)

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID

EUVD-2022-15244

Assigner

palo_alto

Published

Apr 13, 2022, 6:35:10 PM

Updated

Sep 16, 2024, 7:05:33 PM

EUVD base score (CVSS 3.1)

5.9 / 10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

EUVD-reported EPSS

0.7000

Vendors

Palo Alto Networks

Products

PAN-OS (8.1 <8.1.22)

PAN-OS (9.1 <9.1.13)

PAN-OS (10.1 <10.1.5)

PAN-OS (9.0 <9.0.16)

PAN-OS (10.0 <10.0.10)

Aliases

GHSA-x983-h22q-4r7v

ENISA description: An improper handling of exceptional conditions vulnerability exists in the DNS proxy feature of Palo Alto Networks PAN-OS software that enables a meddler-in-the-middle (MITM) to send specifically crafted traffic to the firewall that causes the service to restart unexpectedly. Repeated attempts to send this request result in denial-of-service to all PAN-OS services by restarting the device in maintenance mode. This issue does not impact Panorama appliances and Prisma Access customers. This issue impacts: PAN-OS 8.1 versions earlier than PAN-OS 8.1.22; PAN-OS 9.0 versions earlier than PAN-OS 9.0.16; PAN-OS 9.1 versions earlier than PAN-OS 9.1.13; PAN-OS 10.0 versions earlier than PAN-OS 10.0.10; PAN-OS 10.1 versions earlier than PAN-OS 10.1.5. This issue does not impact PAN-OS 10.2.

Vendor references (0)

References embedded in the original CVE record by the assigning CNA.

None in the CVE record.

Web references (5)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

• http://cwe.mitre.org/data/definitions/755.html rapid7:cwe.mitre.org
• https://attackerkb.com/topics/CVE-2022-0023 rapid7:attackerkb.com
• https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-15244 rapid7:euvd.enisa.europa.eu
• https://security.paloaltonetworks.com/CVE-2022-0023 rapid7:security.paloaltonetworks.com
• https://www.cve.org/CVERecord?id=CVE-2022-0023 rapid7:www.cve.org

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