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CVE-2022-0028· NVD / CVE Program· CNA palo_alto

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

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.

HighCVSS 8.6 · v3.1KEVWeaponized Fix available
Published
Aug 10, 2022
Updated
Jun 17, 2026
EPSS
2.4% · 83th percentile
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Report tools

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Action score

65

This week

Don’t wait for the next maintenance window.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
30 / 30 · Listed
EPSS
1 / 30 · 2.4%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
8.6
CNA · palo_alto
8.6
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Aug 22, 2022. That signals real attacks, not theory.

Remediation deadline for government agencies: Sep 12, 2022.

Affected systems

VendorProduct
paloaltonetworkspan-os

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • paloaltonetworks pan-os8.1.0 and later · before 8.1.23
  • paloaltonetworks pan-os9.0.0 and later · before 9.0.16
  • paloaltonetworks pan-os9.1.0 and later · before 9.1.14
  • paloaltonetworks pan-os10.0.0 and later · before 10.0.11
  • paloaltonetworks pan-os10.1.0 and later · before 10.1.6
  • paloaltonetworks pan-os10.2.0 and later · before 10.2.2
  • paloaltonetworks pan-os10.0.11
  • paloaltonetworks pan-os10.1.6
  • paloaltonetworks pan-os10.2.2
  • paloaltonetworks pan-os8.1.23
  • paloaltonetworks pan-os9.0.16
  • paloaltonetworks pan-os9.1.14

Versions reported by the vendor

Affected version ranges reported by the assigning authority (palo_alto). Independent of NVD's CPE analysis and usually ahead of it.

  • Palo Alto Networks Cloud NGFW

    • Allnot affected

  • Palo Alto Networks PAN-OS

    • 8.1 and later · before 8.1.23-h1affectedfixed in 8.1.23-h1
    • 9.0 and later · before 9.0.16-h3affectedfixed in 9.0.16-h3
    • 9.1 and later · before 9.1.14-h4affectedfixed in 9.1.14-h4
    • 10.0 and later · before 10.0.11-h1affectedfixed in 10.0.11-h1
    • 10.1 and later · before 10.1.6-h6affectedfixed in 10.1.6-h6
    • 10.2 and later · before 10.2.2-h2affectedfixed in 10.2.2-h2

  • Palo Alto Networks Prisma Access

    • 2.1 All, 2.2 All, 3.0 All, 3.1 Allnot affected

Same product

paloaltonetworks: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-3400PAN-OS: Arbitrary File Creation Leads to OS Command Injection Vulnerability in GlobalProtectKEV
    100Now
  • CVE-2017-15944Palo Alto Networks PAN-OS before 6.1.19, 7.0.x before 7.0.19, 7.1.x before 7.1.14, and 8.0.x before 8.0.6 allows remote attackers to executeKEV
    98Now
  • CVE-2024-0012PAN-OS: Authentication Bypass in the Management Web Interface (PAN-SA-2024-0015)KEV
    97Now
  • CVE-2025-0108PAN-OS: Authentication Bypass in the Management Web InterfaceKEV
    95Now
  • CVE-2026-0257PAN-OS: GlobalProtect Authentication Bypass VulnerabilitiesKEV
    90Now
  • CVE-2024-9474PAN-OS: Privilege Escalation (PE) Vulnerability in the Web Management InterfaceKEV
    85Now

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Palo Alto Networks PAN-OS10.0.11-h1Vendor (CNA)
Palo Alto Networks PAN-OS10.1.6-h6Vendor (CNA)
Palo Alto Networks PAN-OS10.2.2-h2Vendor (CNA)
Palo Alto Networks PAN-OS8.1.23-h1Vendor (CNA)
Palo Alto Networks PAN-OS9.0.16-h3Vendor (CNA)
Palo Alto Networks PAN-OS9.1.14-h4Vendor (CNA)

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. CISA KEV+11 d
  3. TodaySep 29, 2026+1511 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Changed
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

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

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records