CVE-2022-0028 — Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability
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.
Who exploits it and how urgent it is
A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.
How the score was calculated
- Confirmed exploitation (CISA KEV)+35
- EPSS 2.5% (30-day exploitation probability)+13
- Technical severity (high)+6
- Automatable exploitation (SSVC)+3
The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).
Triage
Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.
CISA SSVC assessment CISA
Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.
Remediation
Fixes and mitigations documented by the sources — linked to the original advisory.
- Documented mitigation — security.paloaltonetworks.com (NIST National Vulnerability Database)
CISA required action CISA
Apply updates per vendor instructions.
US federal deadline: Sep 12, 2022 — passed 1494 day(s) ago
First 24 hours
Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.
- Identify exposed assets running the affected vendor/product/version combinations (Palo Alto Networks PAN-OS).
- Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
- The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
- Apply the documented mitigations until a definitive fix is available.
- Search available logs for exploit probes, errors and authentication anomalies.
Affected scope
Vendor, product and versions as the sources word them.
| Vendor | Product | Versions | Status | Source |
|---|---|---|---|---|
| Palo Alto Networks | PAN-OS |
version 10.0.11version 10.2.2-h1version 10.2.2version 10.1.6-h3version 10.1.6≥ 8.1.0 and < 8.1.23version 9.1.14-h1version 9.1.14 and 8 moreversion 9.0.16-h2version 9.0.16version 8.1.23≥ 10.2.0 and < 10.2.2≥ 10.1.0 and < 10.1.6≥ 10.0.0 and < 10.0.11≥ 9.1.0 and < 9.1.14≥ 9.0.0 and < 9.0.16 |
Vulnerable | NIST National Vulnerability Database |
| Palo Alto Networks | PAN-OS | ≥ 10.2 and < 10.2.2-h2≥ 10.1 and < 10.1.6-h6≥ 10.0 and < 10.0.11-h1≥ 9.1 and < 9.1.14-h4≥ 9.0 and < 9.0.16-h3≥ 8.1 and < 8.1.23-h1 | Vulnerable | CVE Program (cve.org) e CISA ADP |
Attack characteristics
The CVSS vector, decoded. It describes the attack, not your exposure to it.
Every base score collected
Sources score independently and may disagree; each row says who scored it and under which version.
| Score | Version | Severity | Expl. | Impact | Scored by |
|---|---|---|---|---|---|
| 8.6 | CVSS 3.1 | High | 3.9 | 4.0 | psirt@paloaltonetworks.com via NIST National Vulnerability Database |
| 8.6 | CVSS 3.1 | High | 3.9 | 4.0 | nvd@nist.gov via NIST National Vulnerability Database |
| 8.6 | CVSS 3.1 | High | — | — | GitHub, Inc. via GitHub Security Advisories |
| 8.6 | CVSS 3.1 | High | — | — | palo_alto via CVE Program (cve.org) e CISA ADP |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H (score shown at the top: nvd@nist.gov) Weakness MITRE
Weakness class according to MITRE’s CWE catalog.
CISA KEV details CISA
CISA lists a CVE once it has evidence of exploitation against real targets.
CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.
EPSS over time FIRST
Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 2.54%
Detection
Read off the CVSS vector and the weakness class. Starting points, not tested rules.
- Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
- Hunt retroactively in logs from before Aug 22, 2022 (KEV listing): exploitation may have started earlier.
Timeline
What happened to this CVE, newest first.
- 2026
- Affected products added · palo alto networks/pan-os
- SSVC assessment updated
- Record published
- Fix documented
- Affected products added · paloaltonetworks/pan-os
- CVSS changed · 8.6
- Source status changed · → Analyzed
- Added to CISA KEV (detected)
- Record created in this database
- 2022
- Added to CISA KEV catalog
- CVE published
Source activity
Repeated readings are counted rather than listed.
- 2× References added · Oct 13, 2026 – Oct 13, 2026
- 1× Official description updated · Oct 13, 2026 – Oct 13, 2026
References
4 on the record
Elsewhere on this site
Related CVEs (same products)
- Medium CVE-2026-0320 PAN-OS: Authenticated Admin Command Injection Vulnerability 22h
- Medium CVE-2026-0319 PAN-OS: Improper Input Handling Vulnerability 22h
- Medium CVE-2026-0318 PAN-OS: Denial of Service (DoS) on Panorama 22h
- Low CVE-2026-0316 PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability 22h
- Low CVE-2026-0317 PAN-OS: Denial of Service Vulnerability 22h
- Medium CVE-2026-0321 PAN-OS: Denial of Service (DoS) Vulnerabilities in Network Services 23h
Not in any source we poll
Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.
- No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
- No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
- No exploit packet captures, log samples, or incident case IDs supplied.
Answered from this record
Text assembled only from the fields above — no additional claims.
What should defenders know first?
CVE-2022-0028 is "Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability", rated High. It affects PAN-OS (Palo Alto Networks); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 8.6 describes technical severity. EPSS 2.54% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.
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