CVE-2022-0028
Confirmed PUBLISHEDPAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL Filtering
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Aug 10, 2022
- Exploitation Reported
- Aug 22, 2022
- CVSS
- 8.6 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| paloaltonetworks |
pan-os
|
8.1.0 to < 8.1.23-h |
Affected |
| paloaltonetworks |
pan-os
|
9.0.0 to < 9.0.16-h3 |
Affected |
| paloaltonetworks |
pan-os
|
9.1.0 to < 9.1 < 9.1.14-h4 |
Affected |
| paloaltonetworks |
pan-os
|
10.0.0 to < 10.0.11-h1 |
Affected |
| paloaltonetworks |
pan-os
|
10.1.0 to < 10.1.6-h6 |
Affected |
| paloaltonetworks |
pan-os
|
10.2.0 to < 10.2.2-h2 |
Affected |
| Palo Alto Networks |
Cloud NGFW
|
All |
Unaffected |
| Palo Alto Networks |
PAN-OS
|
8.1 to < 8.1.23-h1 Changed to unaffected at 8.1.23-h1 |
Affected |
| Palo Alto Networks |
PAN-OS
|
9.0 to < 9.0.16-h3 Changed to unaffected at 9.0.16-h3 |
Affected |
| Palo Alto Networks |
PAN-OS
|
9.1 to < 9.1.14-h4 Changed to unaffected at 9.1.14-h4 |
Affected |
| Palo Alto Networks |
PAN-OS
|
10.0 to < 10.0.11-h1 Changed to unaffected at 10.0.11-h1 |
Affected |
| Palo Alto Networks |
PAN-OS
|
10.1 to < 10.1.6-h6 Changed to unaffected at 10.1.6-h6 |
Affected |
| Palo Alto Networks |
PAN-OS
|
10.2 to < 10.2.2-h2 Changed to unaffected at 10.2.2-h2 |
Affected |
| Palo Alto Networks |
Prisma Access
|
2.1 All |
Unaffected |
| Palo Alto Networks |
Prisma Access
|
2.2 All |
Unaffected |
| Palo Alto Networks |
Prisma Access
|
3.0 All |
Unaffected |
| Palo Alto Networks |
Prisma Access
|
3.1 All |
Unaffected |
CVE References
- security.paloaltonetworks.com/CVE-2022-0028 security.paloaltonetworks.com · CVE Record https://security.paloaltonetworks.com/CVE-2022-0028
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-08-22 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Exploitation Status
Exploited in the wild
Recorded 2022-08-22 00:00:00 UTC · CISA
Weaknesses (CWE)
-
Insufficient Control of Network Message Volume (Network Amplification)
Scanner Integrations
| Scanner | Reference | Detected |
|---|---|---|
| Nessus | https://www.tenable.com/plugins/nessus/164071 | Jun 02, 2025 |
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
09:27 UTC about 1 year ago09:27 UTC · about 1 year ago
Nessus plugin available
Scanner coverage available
-
00:00 UTC almost 4 years ago00:00 UTC · almost 4 years ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
16:00 UTC almost 4 years ago16:00 UTC · almost 4 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC over 4 years ago00:00 UTC · over 4 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2022-0028
{
"cve_id": "CVE-2022-0028",
"title": "PAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL ...",
"affected_vendor": "Palo Alto Networks",
"affected_product": "Cloud NGFW, PAN-OS, Prisma Access",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 8.6,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}