{"id":"CVE-2022-0028","published":"2022-08-10T16:15:08Z","modified":"2026-06-17T04:19:55Z","title":"Palo Alto Networks PAN-OS Reflected Amplification Denial-of-Service Vulnerability","vendor":"Palo Alto Networks","product":"PAN-OS","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"A misconfigured URL filtering policy in Palo Alto Networks PAN-OS on PA-Series, VM-Series, and CN-Series firewalls lets the device be abused to generate reflected, amplified TCP denial-of-service traffic toward an attacker-chosen target. An external network-based attacker can exploit it without authentication or user interaction, but only when the firewall has a URL filtering profile with one or more blocked categories assigned to a source zone that has an external-facing interface.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:14:13Z"},"cvss":{"score":8.6,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","provenance":"source","from":"NVD"},"epss":{"score":0.0269,"percentile":0.85837,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2022-08-22","dueDate":"2022-09-12","ransomware":false,"requiredAction":"Apply updates per vendor instructions.","notes":"https://security.paloaltonetworks.com/CVE-2022-0028; https://nvd.nist.gov/vuln/detail/CVE-2022-0028","provenance":"source"},"vulncheckKev":{"dateAdded":"2022-08-10","exploitedFirstSeen":"2022-08-10","ransomware":false,"evidence":[{"url":"https://security.paloaltonetworks.com/CVE-2022-0028","date":"2022-08-10"},{"url":"https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json","date":"2022-08-22"},{"url":"https://isc.sans.edu/diary/rss/32126","date":"2025-07-21"}],"evidenceTotal":3,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"},{"name":"Actively_Exploited_Kev | Oct 18, 2026","url":"https://otx.alienvault.com/pulse/6ad38c22e1848f8189d1c121","created":"2026-10-17"}],"provenance":"machine"},"cwes":[{"id":"CWE-406","name":"Insufficient Control of Network Message Volume (Network Amplification)"},{"id":"CWE-940","name":"Improper Verification of Source of a Communication Channel"}],"references":[{"url":"https://security.paloaltonetworks.com/CVE-2022-0028","tags":["Mitigation","Third Party Advisory"]},{"url":"https://security.paloaltonetworks.com/CVE-2022-0028","tags":["Mitigation","Third Party Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-0028","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Denial of Service","mappingType":"exploitation_technique","evidence":[],"comment":"CVE-2022-0028 is a reflected amplification Distributed-Denial-of-Service (DDoS) vulnerability with Palo Alto's PAN-OS firewall software. Public reports have announced the attempted exploit of this vulnerability to produce DDOS attack. ","confidence":"high"},{"id":"T1498","name":"Network Denial of Service","tactics":["impact"],"provenance":"source","basis":"ctid-kev","bases":["ctid-kev"],"basisDetail":"CTID Mappings Explorer KEV 07/28/2025 (ATT&CK 16.1); capability: Denial of Service","mappingType":"primary_impact","evidence":[],"comment":"CVE-2022-0028 is a reflected amplification Distributed-Denial-of-Service (DDoS) vulnerability with Palo Alto's PAN-OS firewall software. Public reports have announced the attempted exploit of this vulnerability to produce DDOS attack. ","confidence":"high"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2022-15249","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-15249","exploited":true,"exploitedSince":"2022-08-22","provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"source"},{"stage":"primary","techniques":["T1498"],"provenance":"source"}],"timeline":[{"date":"2022-08-10","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0028","provenance":"source"},{"date":"2022-08-10","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://security.paloaltonetworks.com/CVE-2022-0028","provenance":"source"},{"date":"2022-08-22","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2022-08-22","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-15249","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":12},"priority":{"score":61.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 1541 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":17.17,"detail":"percentile 0.8584"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":6.02,"detail":"base score 8.6"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}