{"id":"CVE-2024-3393","kind":"vulnerability","aliases":["CVE-2024-3393"],"related":[],"title":"A Denial of Service vulnerability in the DNS Security feature of Palo Alto Networks PAN-OS software allows an…","description":"Palo Alto Networks PAN-OS contains a vulnerability in parsing and logging malicious DNS packets in the DNS Security feature that, when exploited, allows an unauthenticated attacker to remotely reboot the firewall. Repeated attempts to trigger this condition will cause the firewall to enter maintenance mode.\n\nCISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","summary":"A malformed DNS packet sent to a Palo Alto Networks PAN-OS firewall with DNS Security enabled can make the firewall reboot, and repeated attempts put it into maintenance mode. CISA lists it as actively exploited.","severity":"high","cvss":8.7,"epss":null,"exploited":true,"exploited_at":"2024-12-30T00:00:00+00:00","products":[{"name":"Palo Alto Networks PAN-OS","fixed":[],"affected":"","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":">= 11.1.0, <= 11.1.1","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":["11.2.3"],"affected":">= 11.2.0, < 11.2.3","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.1.14","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.8","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.9","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.10","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.11","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.12","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 10.2.13","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.2","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.3","ecosystem":"vendor"},{"name":"paloaltonetworks pan-os","fixed":[],"affected":"= 11.1.4","ecosystem":"vendor"},{"name":"paloaltonetworks prisma access","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","firewall","infrastructure","network-appliance","palo-alto","pan-os"],"not_affected_if":["dns-security-disabled"],"how_to_check":"Check whether DNS Security is enabled on the PAN-OS firewall; the sources do not give a specific command or setting path.","fix":"Apply the mitigations in the Palo Alto Networks vendor advisory, or discontinue use of the product if mitigations are unavailable (per CISA). Fixed version: unknown.","status":"open","published_at":"2024-12-27T10:15:17+00:00","first_seen_at":"2026-10-23T19:11:51+00:00","triaged_at":"2026-10-23T20:52:47+00:00","updated_at":"2026-10-23T22:29:05+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T20:52:47Z","model":"claude-haiku-5-5","output":{"fix":"Apply the mitigations in the Palo Alto Networks vendor advisory, or discontinue use of the product if mitigations are unavailable (per CISA). Fixed version: unknown.","reach":"network","impact":"medium","summary":"A malformed DNS packet sent to a Palo Alto Networks PAN-OS firewall with DNS Security enabled can make the firewall reboot, and repeated attempts put it into maintenance mode. CISA lists it as actively exploited.","category":"infrastructure","who_cares":["palo-alto","pan-os","firewall","network-appliance"],"confidence":0.7,"needs_auth":"no","worst_case":"Unauthenticated attacker reboots the firewall and forces maintenance mode, disrupting network protection","analyst_note":"Find the fixed PAN-OS versions and the exact DNS Security mitigation steps in the Palo Alto Networks advisory for CVE-2024-3393; sources only link to the CISA KEV search page.","how_to_check":"Check whether DNS Security is enabled on the PAN-OS firewall; the sources do not give a specific command or setting path.\nunknown\nunknown","needs_analyst":true,"not_affected_if":["dns-security-disabled"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000501,"input_tokens":2701,"output_tokens":462,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2024':21A,24A '-3393':22A,25A 'access':82A 'action':181C 'activ':130B 'allow':19A,156C 'alto':13A,27A,91B,103B,133C 'appli':182C 'applianc':88B 'attack':159C 'attempt':120B,166C 'caus':172C 'cisa':126B,179C 'condit':170C 'contain':138C 'cve':20A,23A 'denial':2A 'discontinu':188C 'dns':8A,97B,110B,146C,150C 'enabl':112B 'enter':176C 'exploit':83B,131B,155C 'featur':10A,152C 'firewal':84B,108B,116B,164C,174C 'infrastructur':85B 'instruct':186C 'list':127B 'log':144C 'mainten':124B,177C 'make':114B 'malform':96B 'malici':145C 'mitig':183C,194C 'mode':125B,178C 'network':14A,87B,104B,134C 'network-appli':86B 'networks':28A 'os':17A,31A,35A,39A,43A,47A,51A,55A,59A,63A,67A,71A,75A,79A,94B,107B,137C 'packet':98B,147C 'palo':12A,26A,90B,102B,132C 'palo-alto':89B 'paloaltonetworks':32A,36A,40A,44A,48A,52A,56A,60A,64A,68A,72A,76A,80A 'pan':16A,30A,34A,38A,42A,46A,50A,54A,58A,62A,66A,70A,74A,78A,93B,106B,136C 'pan-o':15A,92B,105B,135C 'pan-os':29A,33A,37A,41A,45A,49A,53A,57A,61A,65A,69A,73A,77A 'pars':142C 'per':184C 'prisma':81A 'product':192C 'put':121B 'reboot':117B,162C 'remot':161C 'repeat':119B,165C 'requir':180C 'secur':9A,111B,151C 'sent':99B 'servic':4A 'softwar':18A 'trigger':168C 'unauthent':158C 'unavail':196C 'use':189C 'vendor':185C 'vulner':5A,140C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2024-12-27T10:15:17+00:00","kev":{"dateAdded":"2024-12-30","dueDate":"2025-01-20","requiredAction":"Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:U/V:C/RE:M/U:Amber","cvss_by":"psirt@paloaltonetworks.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2024-3393","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2024-3393","severity":null,"published_at":"2024-12-30T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:51+00:00","fetched_at":"2026-10-25T14:39:38+00:00","note":null},{"source":"nvd","external_id":"CVE-2024-3393","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-3393","severity":null,"published_at":"2024-12-27T10:15:17+00:00","modified_at":"2026-06-17T07:44:11+00:00","first_seen_at":"2026-10-23T22:29:05+00:00","fetched_at":"2026-10-23T22:29:05+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}