CVE-2022-0023

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

At a glance

Severity: MEDIUM 5.9
EPSS: EPSS 0.73 % · percentile 54 (2026-10-27)
State: PUBLISHED
Published: 2022-04-13
Updated: 2024-09-16
Assigner: palo_alto
NVD status: Modified

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.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	palo_alto
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · psirt@paloaltonetworks.com (Secondary)
CVSS 3.1	MEDIUM 5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · nvd@nist.gov (Primary)
CVSS 2.0	MEDIUM 4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P	NVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

CWE-755

European references

ENISA EUVD · EUVD-2022-15244
GCVE · GCVE-0-2022-0023

CERT-FR advisories

CERTFR-2022-AVI-342 — Vulnérabilité dans les produits Palo Alto Networks · cert.ssi.gouv.fr

Affected configurations (NVD CPE)

cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* ≥ 8.1.0 < 8.1.22
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* ≥ 9.0.0 < 9.0.16
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* ≥ 9.1.0 < 9.1.13
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* ≥ 10.0.0 < 10.0.10
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:* ≥ 10.1.0 < 10.1.5

Affected products

Product	Versions
Palo Alto Networks · PAN-OS	unaffected 10.2.* ; affected 8.1 < 8.1.22 ; affected 9.1 < 9.1.13 ; affected 10.1 < 10.1.5 ; affected 10.0 < 10.0.10 ; affected 9.0 < 9.0.16
Palo Alto Networks · Prisma Access	unaffected 3.0 Preferred, Innovation ; unaffected 2.2 Preferred ; unaffected 2.1 Preferred, Innovation

References

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

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD