# What is CVE-2022-0028?

> CVE-2022-0028 is a high-severity flaw (CVSS 8.6) in PAN-OS from Palo Alto Networks, published on 10 August 2022. It is on the list of flaws known to be exploited, so criminals are already using it. The latest forecast puts its chance of use in the next 30 days at 2.5%. If you run an affected version, patch it first.

Canonical page: https://www.precursorintelligence.com/what-is/cve-2022-0028

## At a glance

- **Verdict:** Fix this now. Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.
- **Precursor Intelligence risk score:** 80 out of 100 (High); action: Emergency patch. Kept up to date as the evidence changes.
- **Severity:** High (CVSS 8.6 out of 10)
- **Known to be exploited:** Yes, it is on the government list of flaws known to be exploited
- **Chance of use in the next 30 days:** 2.5% (latest exploit-likelihood forecast)
- **Published:** 10 August 2022
- **Record last updated:** 4 November 2025
- **Main product:** PAN-OS from Palo Alto Networks
- **Affected products:** 1

## What is CVE-2022-0028? In plain terms

It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### The official description

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.

### What kind of flaw is it?

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

### How an attack on it works

- Where an attacker can be: Anywhere on the internet
- How hard it is to pull off: Easy: no special conditions
- Login needed first: No login needed
- Does someone have to click: No, nobody has to do anything
- What an attacker gets: Can take it offline

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

## Is CVE-2022-0028 being exploited? Yes

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 2.5%.

Exploit likelihood over the last 7 days: 2.5%, 2.5%, 2.5%, 2.5%, 2.5%, 2.5%, 2.5%.

### Timeline

- 10 August 2022: Published
- 4 November 2025: Record last updated

### How Precursor Intelligence ranks it

CVE-2022-0028 scores **80 out of 100 (High)**, with the action "Emergency patch".

Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less:

- Evidence it is being exploited: biggest factor
- How severe it is: strong factor
- How widely exposed it is: smaller factor
- Threat activity around it: smaller factor

85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it.

## Who is affected by CVE-2022-0028?

The published record lists 1 product. Versions are as published: "8.1.0 to before 8.1.23" means from 8.1.0 up to, but not including, 8.1.23.

- [PAN-OS](https://www.precursorintelligence.com/product/paloaltonetworks/pan-os) by [Palo Alto Networks](https://www.precursorintelligence.com/vendors/paloaltonetworks) (Operating system): 8.1.0 to before 8.1.23, 8.1.23, 9.0.0 to before 9.0.16, 9.0.16, 9.0.16-h2, 9.1.0 to before 9.1.14, 9.1.14, 9.1.14-h1, 10.0.0 to before 10.0.11, 10.0.11, 10.1.0 to before 10.1.6, 10.1.6, 10.1.6-h3, 10.2.0 to before 10.2.2, 10.2.2, 10.2.2-h1

## How do I fix CVE-2022-0028?

1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list.
2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisory first in the list.
3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in.
4. **Check it wasn’t used before you patched.** Because criminals are already using this flaw, look for signs of a break-in on affected systems using the vendor’s guidance.

### References

- [security.paloaltonetworks.com](https://security.paloaltonetworks.com/CVE-2022-0028) (Mitigation, Third-party advisory)
- [cisa.gov](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-0028) (Government resource)

## Questions

### What is CVE-2022-0028?

CVE-2022-0028 is a high-severity flaw in PAN-OS from Palo Alto Networks, published on 10 August 2022. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline.

### How serious is CVE-2022-0028?

It scores 8.6 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2022-0028 is 80 out of 100, which is High. Its action is "Emergency patch". Attackers are using this flaw today. If you run an affected version, it goes to the top of your list.

### Is CVE-2022-0028 being exploited?

Attackers are already using it. It is on the government list of flaws known to be exploited, and the latest forecast puts the chance of it being used in the next 30 days at 2.5%.

### Which versions does CVE-2022-0028 affect?

For PAN-OS from Palo Alto Networks: 8.1.0 to before 8.1.23, 8.1.23, 9.0.0 to before 9.0.16, 9.0.16, 9.0.16-h2, 9.1.0 to before 9.1.14 and 10 more.

### How do I fix CVE-2022-0028?

Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. Because criminals are already using it, also check affected systems for signs of a break-in.

## Does CVE-2022-0028 affect you?

Precursor Intelligence keeps checking for you:

- **Tell us what you run.** Pick your software from a list, or let us work it out from your website.
- **We match it to every flaw.** Over 400,000 published flaws, checked against your list.
- **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it.
- **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools.

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