{"document":{"category":"csaf_vex","csaf_version":"2.1","notes":[{"category":"summary","text":"Palo Alto Networks PSIRT provided VEX document. This document is autogenerated.","title":"PAN-OS: Information exposure in Ethernet data frame construction (Etherleak)"}],"publisher":{"category":"vendor","name":"Palo Alto Networks","namespace":"https://security.paloaltonetworks.com"},"title":"Palo Alto Networks PSIRT provided VEX document: CVE-2021-3031","distribution":{"text":"Copyright © 2024 Palo Alto Networks. All rights reserved.","tlp":{"label":"CLEAR","url":"https://www.first.org/tlp/"}},"tracking":{"current_release_date":"2026-04-08T08:18:09.533Z","generator":{"date":"2026-04-08T08:18:09.533Z","engine":{"name":"Vulnogram","version":"0.0.9"}},"id":"CVE-2021-3031","initial_release_date":"2021-01-13T17:00:00.000Z","revision_history":[{"number":"1","date":"2021-01-13T09:00:00.000Z","summary":"Initial publication"},{"number":"2","date":"2021-01-14T06:44:00.000Z","summary":"Update affected hardware series names for compatible PAN-OS versions."},{"number":"3","date":"2021-01-19T15:30:00.000Z","summary":"Update affected hardware series names for compatible PAN-OS versions."}],"status":"final","version":"1"}},"product_tree":{"branches":[{"name":"Palo Alto Networks","category":"vendor","branches":[]}]},"vulnerabilities":[{"cve":"CVE-2021-3031","product_status":{"known_affected":["PANW-PAN-OS-313","PANW-PAN-OS-312","PANW-PAN-OS-310","PANW-PAN-OS-314","PANW-PAN-OS-318"],"known_not_affected":["PANW-PAN-OS-281","PANW-PAN-OS-315","PANW-PAN-OS-316","PANW-PAN-OS-317"]},"notes":[{"category":"description","text":"Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-5000 Series, 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.\n\nThis issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001."}],"references":[{"category":"external","summary":"NVD - CVE-2021-3031","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3031"},{"category":"self","summary":"Palo Alto Networks Security Advisory CVE-2021-3031","url":"https://security.paloaltonetworks.com/CVE-2021-3031"}],"threats":[{"category":"impact","description":"Padding bytes in Ethernet packets on PA-200, PA-220, PA-500, PA-5000 Series, 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.\n\nThis issue is also known as Etherleak and is detected by security scanners as CVE-2003-0001."}],"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM"},"products":["PANW-PAN-OS-313","PANW-PAN-OS-312","PANW-PAN-OS-310","PANW-PAN-OS-314","PANW-PAN-OS-318"]}]}]}