CVE-2022-0023

PAN-OS: Denial-of-Service (DoS) Vulnerability in DNS Proxy

MEDIUM

5.9

CVSS Score

Published: April 13, 2022 at 06:35 PM UTC

Updated: June 17, 2026 at 04:19 AM UTC

1 product affected across 1 vendorPAN-OS

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Severity

MEDIUM5.9

Exploit prediction

EPSS 0.7%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

PAN-OS · Palo Alto Networks

95%

10.0 ≤ v < 10.0.1010.0.0 ≤ v < 10.0.1010.1 ≤ v < 10.1.510.1.0 ≤ v < 10.1.58.1 ≤ v < 8.1.228.1.0 ≤ v < 8.1.229.0 ≤ v < 9.0.169.0.0 ≤ v < 9.0.169.1 ≤ v < 9.1.139.1.0 ≤ v < 9.1.1310.010.18.1 9.0 9.1

Affected range stops below 10.0.10, so it looks safe — our inference, not a vendor statement

Affected range stops below 10.1.5, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 10.2.* (unaffected)

Affected range stops below 8.1.22, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.0.16, so it looks safe — our inference, not a vendor statement

Affected range stops below 9.1.13, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://security.paloaltonetworks.com/CVE-2022-0023

References (1)

x_refsource_MISCVendor Advisory

Source: [email protected]

https://security.paloaltonetworks.com/CVE-2022-0023

CVSS

5.9MEDIUMpalo_alto

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-755

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