{"id":"CVE-2018-13379","kind":"vulnerability","aliases":["CVE-2018-13379"],"related":[],"title":"Fortinet FortiOS: Fortinet FortiOS SSL VPN Path Traversal Vulnerability","description":"An Improper Limitation of a Pathname to a Restricted Directory (\"Path Traversal\") in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 and 5.4.6 to 5.4.12 and FortiProxy 2.0.0, 1.2.0 to 1.2.8, 1.1.0 to 1.1.6, 1.0.0 to 1.0.7 under SSL VPN web portal allows an unauthenticated attacker to download system files via special crafted HTTP resource requests.","summary":"Fortinet FortiOS SSL VPN web portal has a path traversal flaw that lets an unauthenticated remote attacker download FortiOS system files via crafted HTTP requests. The flaw is on the VPN appliance, and CISA lists it as actively exploited in the wild, with ransomware use noted in the sources.","severity":"critical","cvss":9.8,"epss":0.99999,"exploited":true,"exploited_at":"2021-11-03T00:00:00+00:00","products":[{"name":"Fortinet FortiOS","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","fortinet","fortios","infrastructure","ransomware","self-hosted","ssl-vpn"],"not_affected_if":["no-ssl-vpn-enabled","not-fortios"],"how_to_check":"Check whether the SSL VPN web portal is reachable from the internet and which FortiOS version is running (unknown for exact affected versions in the sources).","fix":"Apply the FortiOS update per Fortinet's vendor instructions (fixed version unknown in the sources).\nIf patching is not immediate, restrict access to the SSL VPN portal (unknown specific setting in the sources).","status":"open","published_at":"2019-06-04T21:29:00+00:00","first_seen_at":"2026-10-23T19:11:53+00:00","triaged_at":"2026-10-23T21:39:41+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"infrastructure","confidence":0.7,"triage":{"at":"2026-10-23T21:39:41Z","model":"claude-haiku-5-5","output":{"fix":"Apply the FortiOS update per Fortinet's vendor instructions (fixed version unknown in the sources).\nIf patching is not immediate, restrict access to the SSL VPN portal (unknown specific setting in the sources).","reach":"internet","impact":"high","summary":"Fortinet FortiOS SSL VPN web portal has a path traversal flaw that lets an unauthenticated remote attacker download FortiOS system files via crafted HTTP requests. The flaw is on the VPN appliance, and CISA lists it as actively exploited in the wild, with ransomware use noted in the sources.","category":"infrastructure","who_cares":["fortios","fortinet","ssl-vpn","self-hosted"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker downloads system files, potentially including credentials, from the appliance","analyst_note":"Find the affected and fixed FortiOS versions and the exact check or mitigation from Fortinet's advisory for CVE-2018-13379; sources do not give them.","how_to_check":"Check whether the SSL VPN web portal is reachable from the internet and which FortiOS version is running (unknown for exact affected versions in the sources).\nunknown for a specific command or config path in the sources.","needs_analyst":true,"not_affected_if":["no-ssl-vpn-enabled","not-fortios"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"critical"},"cost_usd":0.00054,"input_tokens":2862,"output_tokens":507,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-13379':12A,15A '-2018':11A,14A '1.0.0':112C '1.0.7':114C '1.1.0':109C '1.1.6':111C '1.2.0':106C '1.2.8':108C '2.0.0':105C '5.4.12':102C '5.4.6':100C '5.6.3':96C '5.6.7':98C '6.0.0':93C '6.0.4':95C 'activ':66B 'allow':120C 'applianc':60B 'attack':45B,123C 'cisa':62B 'craft':51B,130C 'cve':10A,13A 'directori':87C 'download':46B,125C 'exploit':18B,67B 'file':49B,127C 'flaw':39B,55B 'fortinet':1A,3A,16A,19B,29B,91C 'fortio':2A,4A,20B,30B,47B,92C 'fortios':17A 'fortiproxi':104C 'host':25B 'http':52B,131C 'improp':79C 'infrastructur':21B 'let':41B 'limit':80C 'list':63B 'note':74B 'path':7A,37B,88C 'pathnam':83C 'portal':34B,119C 'ransomwar':22B,72B 'remot':44B 'request':53B,133C 'resourc':132C 'restrict':86C 'self':24B 'self-host':23B 'sourc':77B 'special':129C 'ssl':5A,27B,31B,116C 'ssl-vpn':26B 'system':48B,126C 'travers':8A,38B,89C 'unauthent':43B,122C 'use':73B 'via':50B,128C 'vpn':6A,28B,32B,59B,117C 'vulner':9A 'web':33B,118C 'wild':70B","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2019-06-04T21:29:00+00:00","kev":{"dateAdded":"2021-11-03","dueDate":"2022-05-03","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Known"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","cvss_by":"psirt@fortinet.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2018-13379","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2018-13379","severity":null,"published_at":"2021-11-03T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:53+00:00","fetched_at":"2026-10-25T11:39:18+00:00","note":null},{"source":"epss","external_id":"CVE-2018-13379","url":"https://api.first.org/data/v1/epss?cve=CVE-2018-13379","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2018-13379","url":"https://nvd.nist.gov/vuln/detail/CVE-2018-13379","severity":null,"published_at":"2019-06-04T21:29:00+00:00","modified_at":"2026-06-17T01:39:18+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+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"}