CVE-2022-0028: Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability

CISA Known Exploited Vulnerabilities

Name

Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability

Vendor

Palo Alto Networks

Product

PAN-OS

Added to the catalog

2022-08-22

Due date for US federal agencies

2022-09-12

Weaknesses

CWE-940

Catalog version

2026.10.30

A Palo Alto Networks PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks.

Required action (CISA)

Apply updates per vendor instructions.

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://security.paloaltonetworks.com/CVE-2022-0028
• https://nvd.nist.gov/vuln/detail/CVE-2022-0028

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2022-08-10T16:15:08.343

Last modified

2026-06-17T04:19:55.243

Weaknesses

CWE-406, NVD-CWE-Other

A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a source zone that has an external facing interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All software updates for this issue are expected to be released no later than the week of August 15, 2022. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them.

References

• https://security.paloaltonetworks.com/CVE-2022-0028 (Mitigation, Third Party Advisory)
• https://security.paloaltonetworks.com/CVE-2022-0028 (Mitigation, Third Party Advisory)
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-0028 (US Government Resource)

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:41:59.479Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2022-0028

CVE record

Title (CNA)

PAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL Filtering

Assigner

palo_alto

State

PUBLISHED

Published

2022-08-10T16:00:16.743Z

Updated

2025-10-21T23:15:36.930Z

Problem types

CWE-406 Insufficient Control of Network Message Volume (Network Amplification)

A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a source zone that has an external facing interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All software updates for this issue are expected to be released no later than the week of August 15, 2022. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them.

References

• https://security.paloaltonetworks.com/CVE-2022-0028

Read on 2026-11-03T01:09:24.635Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2022/0xxx/CVE-2022-0028.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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