{"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: Exceptional Condition Denial-of-Service (DoS)"}],"publisher":{"category":"vendor","name":"Palo Alto Networks","namespace":"https://security.paloaltonetworks.com"},"title":"Palo Alto Networks PSIRT provided VEX document: CVE-2021-3053","distribution":{"text":"Copyright © 2024 Palo Alto Networks. All rights reserved.","tlp":{"label":"CLEAR","url":"https://www.first.org/tlp/"}},"tracking":{"current_release_date":"2026-04-11T00:25:09.789Z","generator":{"date":"2026-04-11T00:25:09.789Z","engine":{"name":"Vulnogram","version":"0.0.9"}},"id":"CVE-2021-3053","initial_release_date":"2021-09-08T16:00:00.000Z","revision_history":[{"number":"1","date":"2021-09-08T09:00:00.000Z","summary":"Initial publication"},{"number":"2","date":"2021-09-13T09:00:00.000Z","summary":"Added required configuration for exposure and threat prevention workaround for the vulnerability"}],"status":"final","version":"1"}},"product_tree":{"branches":[{"name":"Palo Alto Networks","category":"vendor","branches":[]}]},"vulnerabilities":[{"cve":"CVE-2021-3053","product_status":{"fixed":["PANW-PAN-OS-289","PANW-PAN-OS-290","PANW-PAN-OS-291","PANW-PAN-OS-295"],"known_affected":["PANW-PAN-OS-289","PANW-PAN-OS-290","PANW-PAN-OS-291","PANW-PAN-OS-295"],"known_not_affected":["PANW-PAN-OS-271"]},"notes":[{"category":"description","text":"An improper handling of exceptional conditions vulnerability exists in the Palo Alto Networks PAN-OS dataplane that enables an unauthenticated network-based attacker to send specifically crafted traffic through the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode."}],"references":[{"category":"external","summary":"NVD - CVE-2021-3053","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-3053"},{"category":"self","summary":"Palo Alto Networks Security Advisory CVE-2021-3053","url":"https://security.paloaltonetworks.com/CVE-2021-3053"}],"threats":[{"category":"impact","description":"An improper handling of exceptional conditions vulnerability exists in the Palo Alto Networks PAN-OS dataplane that enables an unauthenticated network-based attacker to send specifically crafted traffic through the firewall that causes the service to crash. Repeated attempts to send this request result in denial of service to all PAN-OS services by restarting the device and putting it into maintenance mode."}],"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"products":["PANW-PAN-OS-289","PANW-PAN-OS-290","PANW-PAN-OS-291","PANW-PAN-OS-295"]}]}]}