What it is
CVE-2022-0028 is an unauthenticated vulnerability affecting Palo Alto Networks Cloud NGFW and 2 other products. A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected...
Vulnerability report
Exploited in the wild
Confirmed confidence
In CISA KEV
CVE-2022-0028
Cloud NGFW Denial of Service
Palo Alto Networks / Cloud NGFW · affected before 8.1.23-h
- Severity
- CVSS 8.6 · High
- Confidence
- Confirmed
- Exploit status
- Exploited in the wild
- EPSS
- 2.4%
- First observed
- —
- Last observed
- —
Decision summary
What security teams need to know first
Direct answers before the deeper technical record.
Is it exploited?
Yes. KEV Intelligence tracks this CVE as a known exploited vulnerability. Confidence is confirmed.
Who is affected?
Palo Alto Networks / Cloud NGFW affected before 8.1.23-h.
What should we do?
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
Overview
Cloud NGFW Denial of Service
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.
Vendor
Product
Affected
Status
paloaltonetworks
pan-os
Before 8.1.23-h
Affected
paloaltonetworks
pan-os
Before 9.0.16-h3
Affected
paloaltonetworks
pan-os
Before 9.1 < 9.1.14-h4
Affected
paloaltonetworks
pan-os
Before 10.0.11-h1
Affected
paloaltonetworks
pan-os
Before 10.1.6-h6
Affected
paloaltonetworks
pan-os
Before 10.2.2-h2
Affected
Palo Alto Networks
Cloud NGFW
All
Unaffected
Palo Alto Networks
PAN-OS
Before 8.1.23-h1
Affected
Palo Alto Networks
PAN-OS
Before 9.0.16-h3
Affected
Palo Alto Networks
PAN-OS
Before 9.1.14-h4
Affected
Palo Alto Networks
PAN-OS
Before 10.0.11-h1
Affected
Palo Alto Networks
PAN-OS
Before 10.1.6-h6
Affected
Palo Alto Networks
PAN-OS
Before 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
- Published
- 10 Aug 2022
- Exploitation Reported
- 22 Aug 2022
- Attack vector
- Remote
- Complexity
- Low
- Privileges
- None
- User interaction
- None
Tags
nessus_scanner
cisa
edge
CVE References
- CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2022-0028
- security.paloaltonetworks.com/CVE-2022-0028 security.paloaltonetworks.com · CVE Record https://security.paloaltonetworks.com/CVE-2022-0028
Exploitation evidence
Why KEV Intelligence marks this CVE as exploited
Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.
Exploited in the wild
CISA
Independent exploitation attestation added to the KEV Intelligence record.
Known exploited vulnerability sources
Per-source evidence links for KEV attestations are available through the KEV Intelligence Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2022-08-22 00:00 UTC |
Detection
Operational artifacts and observed signals
Make the evidence actionable in scanner, SOC, and edge-control workflows.
Observed signals
- Request targets
- 0
- User-Agents
- 0
Raw values available in Pro and Enterprise.
Scanner coverage
Nessus template detected 02 Jun 2025.
View Nessus template (opens in new tab)Virtual patch status
No KEV Intelligence virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.
Learn about virtual patches →Scanner Artifacts
Scanner and exploit-framework references linked to this CVE.
| Scanner | Reference | Detected |
|---|---|---|
| Nessus | https://www.tenable.com/plugins/nessus/164071 | 02 Jun 2025 |
Risk and context
Severity, weaknesses, and research context
CVSS v3.1
8.6
High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
EPSS
2.4%
Timeline
From disclosure to observed exploitation
-
Nessus plugin available
Scanner coverage available
-
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
CVE published
Vulnerability disclosed publicly
-
CVE ID reserved
Identifier reserved by the CNA
Pro API
Automate this intelligence
Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
- Evidence confidence and provenance
- First-party sensor telemetry
- PoC and scanner references
- Affected versions and enrichment
- Automation-ready JSON delivery
GET /api/v2/pro/kevs/CVE-2022-0028
Free JSON includes basic KEV fields{
"cve_id": "CVE-2022-0028",
"confidence": "Confirmed",
"cvss_score": 8.6,
"cvss_estimated": false,
"epss_score": 0.02366,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "attempts": 0, "sensors": 0 }
}Early warning alerts
Get alerts on high-impact exploitation
Receive curator-selected alerts when exploitation activity warrants attention. Each alert includes the evidence and context needed to decide what requires attention now.