{"id":"CVE-2021-3031","state":"PUBLISHED","title":"PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)","description":"Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200 Series, and PA-7000 Series firewalls are not cleared before the data frame is created. This leaks a small amount of random information from the firewall memory into the Ethernet packets. An attacker on the same Ethernet subnet as the PAN-OS firewall is able to collect potentially sensitive information from these packets. This issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001. This issue impacts: PAN-OS 8.1 version earlier than PAN-OS 8.1.18; PAN-OS 9.0 versions earlier than PAN-OS 9.0.12; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5.","publishedAt":"2021-01-13T18:10:13.174Z","updatedAt":"2024-09-16T16:48:43.134Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","source":"palo_alto"},"assigner":"palo_alto","products":["Palo Alto Networks PAN-OS"],"affected":[{"vendor":"Palo Alto Networks","product":"PAN-OS","versions":[{"version":"8.1","status":"affected","lessThan":"8.1.18","versionType":"custom"},{"version":"9.0","status":"affected","lessThan":"9.0.12","versionType":"custom"},{"version":"9.1","status":"affected","lessThan":"9.1.5","versionType":"custom"}],"platforms":["PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200"]},{"vendor":"Palo Alto Networks","product":"PAN-OS","versions":[{"version":"10.0.*","status":"unaffected"},{"version":"8.1.18","status":"unaffected","lessThan":"8.1*","versionType":"custom"},{"version":"9.0.12","status":"unaffected","lessThan":"9.0*","versionType":"custom"},{"version":"9.1.5","status":"unaffected","lessThan":"9.1*","versionType":"custom"}]}],"references":["https://security.paloaltonetworks.com/CVE-2021-3031"],"weaknesses":["CWE-200"],"ingestedAt":"2026-10-29T19:48:55.807Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2021/3xxx/CVE-2021-3031.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2021-3031","state":"PUBLISHED","datePublished":"2021-01-13T18:10:13.174Z","dateUpdated":"2024-09-16T16:48:43.134Z","assignerShortName":"palo_alto","assignerOrgId":"d6c1279f-00f6-4ef7-9217-f89ffe703ec0","dateReserved":"2021-01-06T00:00:00.000Z"},"containers":{"cna":{"title":"PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)","descriptions":[{"lang":"en","value":"Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200 Series, and PA-7000 Series firewalls are not cleared before the data frame is created. This leaks a small amount of random information from the firewall memory into the Ethernet packets. An attacker on the same Ethernet subnet as the PAN-OS firewall is able to collect potentially sensitive information from these packets. This issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001. This issue impacts: PAN-OS 8.1 version earlier than PAN-OS 8.1.18; PAN-OS 9.0 versions earlier than PAN-OS 9.0.12; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5."}],"affected":[{"vendor":"Palo Alto Networks","product":"PAN-OS","versions":[{"version":"8.1","status":"affected","lessThan":"8.1.18","versionType":"custom"},{"version":"9.0","status":"affected","lessThan":"9.0.12","versionType":"custom"},{"version":"9.1","status":"affected","lessThan":"9.1.5","versionType":"custom"}],"platforms":["PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200"]},{"vendor":"Palo Alto Networks","product":"PAN-OS","versions":[{"version":"10.0.*","status":"unaffected"},{"version":"8.1.18","status":"unaffected","lessThan":"8.1*","versionType":"custom"},{"version":"9.0.12","status":"unaffected","lessThan":"9.0*","versionType":"custom"},{"version":"9.1.5","status":"unaffected","lessThan":"9.1*","versionType":"custom"}]}],"references":[{"url":"https://security.paloaltonetworks.com/CVE-2021-3031","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-200","description":"CWE-200 Information Exposure","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"palo_alto","dateUpdated":"2021-01-13T18:10:13.000Z","orgId":"d6c1279f-00f6-4ef7-9217-f89ffe703ec0"},"credits":[{"lang":"en","value":"This issue was found by a customer of Palo Alto Networks during a security review."}],"datePublic":"2021-01-13T00:00:00.000Z","exploits":[{"lang":"en","value":"Palo Alto Networks is not aware of any malicious exploitation of this issue."}],"solutions":[{"lang":"en","value":"This issue is fixed in PAN-OS 8.1.18, PAN-OS 9.0.12, PAN-OS 9.1.5, and all later PAN-OS versions."}],"source":{"defect":["PAN-124681"],"discovery":"USER"},"timeline":[{"lang":"en","time":"2021-01-13T00:00:00.000Z","value":"Initial publication"}],"workarounds":[{"lang":"en","value":"There is no workaround to prevent the information leak in the Ethernet packets; however, restricting access to the networks mitigates the risk of this issue."}],"x_generator":{"engine":"Vulnogram 0.0.9"},"x_legacyV4Record":{"CVE_data_meta":{"ASSIGNER":"psirt@paloaltonetworks.com","DATE_PUBLIC":"2021-01-13T17:00:00.000Z","ID":"CVE-2021-3031","STATE":"PUBLIC","TITLE":"PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)"},"affects":{"vendor":{"vendor_data":[{"product":{"product_data":[{"product_name":"PAN-OS","version":{"version_data":[{"platform":"PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200","version_affected":"<","version_name":"8.1","version_value":"8.1.18"},{"platform":"PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200","version_affected":"<","version_name":"9.0","version_value":"9.0.12"},{"platform":"PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200","version_affected":"<","version_name":"9.1","version_value":"9.1.5"},{"version_affected":"!>=","version_name":"8.1","version_value":"8.1.18"},{"version_affected":"!>=","version_name":"9.0","version_value":"9.0.12"},{"version_affected":"!>=","version_name":"9.1","version_value":"9.1.5"},{"version_affected":"!","version_name":"10.0","version_value":"10.0.*"}]}}]},"vendor_name":"Palo Alto Networks"}]}},"credit":[{"lang":"eng","value":"This issue was found by a customer of Palo Alto Networks during a security review."}],"data_format":"MITRE","data_type":"CVE","data_version":"4.0","description":{"description_data":[{"lang":"eng","value":"Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-800, PA-2000 Series, PA-3000 Series, PA-3200 Series, PA-5200 Series, and PA-7000 Series firewalls are not cleared before the data frame is created. This leaks a small amount of random information from the firewall memory into the Ethernet packets. An attacker on the same Ethernet subnet as the PAN-OS firewall is able to collect potentially sensitive information from these packets. This issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001. This issue impacts: PAN-OS 8.1 version earlier than PAN-OS 8.1.18; PAN-OS 9.0 versions earlier than PAN-OS 9.0.12; PAN-OS 9.1 versions earlier than PAN-OS 9.1.5."}]},"exploit":[{"lang":"en","value":"Palo Alto Networks is not aware of any malicious exploitation of this issue."}],"generator":{"engine":"Vulnogram 0.0.9"},"impact":{"cvss":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-200 Information Exposure"}]}]},"references":{"reference_data":[{"name":"https://security.paloaltonetworks.com/CVE-2021-3031","refsource":"MISC","url":"https://security.paloaltonetworks.com/CVE-2021-3031"}]},"solution":[{"lang":"en","value":"This issue is fixed in PAN-OS 8.1.18, PAN-OS 9.0.12, PAN-OS 9.1.5, and all later PAN-OS versions."}],"source":{"defect":["PAN-124681"],"discovery":"USER"},"timeline":[{"lang":"en","time":"2021-01-13T00:00:00.000Z","value":"Initial publication"}],"work_around":[{"lang":"en","value":"There is no workaround to prevent the information leak in the Ethernet packets; however, restricting access to the networks mitigates the risk of this issue."}],"x_advisoryEoL":false,"x_affectedList":["PAN-OS 9.1.4","PAN-OS 9.1.3-h1","PAN-OS 9.1.3","PAN-OS 9.1.2-h1","PAN-OS 9.1.2","PAN-OS 9.1.1","PAN-OS 9.1.0-h3","PAN-OS 9.1.0-h2","PAN-OS 9.1.0-h1","PAN-OS 9.1.0","PAN-OS 9.1","PAN-OS 9.0.11","PAN-OS 9.0.10","PAN-OS 9.0.9-h1","PAN-OS 9.0.9","PAN-OS 9.0.8","PAN-OS 9.0.7","PAN-OS 9.0.6","PAN-OS 9.0.5","PAN-OS 9.0.4","PAN-OS 9.0.3-h3","PAN-OS 9.0.3-h2","PAN-OS 9.0.3-h1","PAN-OS 9.0.3","PAN-OS 9.0.2-h4","PAN-OS 9.0.2-h3","PAN-OS 9.0.2-h2","PAN-OS 9.0.2-h1","PAN-OS 9.0.2","PAN-OS 9.0.1","PAN-OS 9.0.0","PAN-OS 9.0","PAN-OS 8.1.17","PAN-OS 8.1.16","PAN-OS 8.1.15-h3","PAN-OS 8.1.15-h2","PAN-OS 8.1.15-h1","PAN-OS 8.1.15","PAN-OS 8.1.14-h2","PAN-OS 8.1.14-h1","PAN-OS 8.1.14","PAN-OS 8.1.13","PAN-OS 8.1.12","PAN-OS 8.1.11","PAN-OS 8.1.10","PAN-OS 8.1.9-h4","PAN-OS 8.1.9-h3","PAN-OS 8.1.9-h2","PAN-OS 8.1.9-h1","PAN-OS 8.1.9","PAN-OS 8.1.8-h5","PAN-OS 8.1.8-h4","PAN-OS 8.1.8-h3","PAN-OS 8.1.8-h2","PAN-OS 8.1.8-h1","PAN-OS 8.1.8","PAN-OS 8.1.7","PAN-OS 8.1.6-h2","PAN-OS 8.1.6-h1","PAN-OS 8.1.6","PAN-OS 8.1.5","PAN-OS 8.1.4","PAN-OS 8.1.3","PAN-OS 8.1.2","PAN-OS 8.1.1","PAN-OS 8.1.0","PAN-OS 8.1"]}},"adp":[{"title":"CVE Program Container","references":[{"url":"https://security.paloaltonetworks.com/CVE-2021-3031","tags":["x_refsource_MISC","x_transferred"]}],"providerMetadata":{"shortName":"CVE","orgId":"af854a3a-2127-422b-91ae-364da2661108","dateUpdated":"2024-08-03T16:45:50.688Z"}}]}}}