known ransomware use

Fortinet FortiOS SSL VPN Path Traversal Vulnerability

Added to KEV
2021-11-03
Federal due date
2022-05-03
Vendor
Fortinet
Product
FortiOS
EPSS
100.0th percentile (score 0.945, as of 2026-06-08)
NVD CVSS v3.1
Ransomware use
Known
Upstream
https://nvd.nist.gov/vuln/detail/CVE-2018-13379

CISA short description

Fortinet FortiOS SSL VPN web portal contains a path traversal vulnerability that may allow an unauthenticated attacker to download FortiOS system files through specially crafted HTTP resource requests.

Required action

Apply updates per vendor instructions.

EPSS percentile is the FIRST.org exploit-probability ranking as of the date noted above; it moves daily. CVSS reflects NVD's analysis at time of publication.