Secuno
ENNL
Book demo

CVE-2022-0028

Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service

8.6 HIGHActively exploited (CISA KEV)EPSS 2.54%
  1. Published10 Aug 2022
  2. Added to CISA KEV22 Aug 2022
  3. Remediation due12 Sept 2022
Actively exploited (CISA KEV)

A Palo Alto Networks PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks.

Added to KEV: 22 Aug 2022Federal remediation due: 12 Sept 2022

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

Palo Alto Networks PAN-OS≥ 10.0.0 < 10.0.11 · ≥ 10.1.0 < 10.1.6 · ≥ 10.2.0 < 10.2.2 · ≥ 8.1.0 < 8.1.23

Remediation

Fixed in
Palo Alto Networks PAN-OS≥ 10.0.11

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-546098.6
QTI Neon is a minimal, game-agnostic, relay-based UDP multiplayer protocol library. In…
CVE-2021-384878.2
RTI Connext Professional versions 4.1 to 6.1.0, and Connext Micro versions 2.4 and…

Frequently asked

Is CVE-2022-0028 being actively exploited?

Yes. CVE-2022-0028 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 22 Aug 2022.

How severe is CVE-2022-0028?

CVE-2022-0028 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 2.54% probability of exploitation.

Which products are affected by CVE-2022-0028?

Affected products include Palo Alto Networks PAN-OS.

How do I fix CVE-2022-0028?

Upgrade affected software to a fixed version, for example Palo Alto Networks PAN-OS 10.0.11 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-0028 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.