Fortinet FortiOS known exploited vulnerabilities
We track 9 CVEs in Fortinet FortiOS. All of them are on CISA's Known Exploited Vulnerabilities catalog, meaning CISA has evidence of exploitation in the wild (listed 2021–2026). CISA flags 6 of them as used in ransomware campaigns. The most recent is CVE-2025-68686, added to KEV on .
- CVEs tracked
- 9
- On CISA KEV
- 9
- Ransomware use
- 6
- Rated critical
- 4
Every Fortinet FortiOS CVE we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV | Patch by |
|---|---|---|---|---|---|
| CVE-2025-68686 FortiOS patch bypass re-enables symbolic link persistence on compromised deviceswrite-up | [ MEDIUM ] | 5.9 | 29.5% | ||
| CVE-2019-6693 Fortinet FortiOS Use of Hard-Coded Credentials Vulnerabilityransomware use | [ MEDIUM ] | 6.5 | 6.6% | ||
| CVE-2024-21762 Fortinet FortiOS Out-of-Bound Write Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 83.4% | ||
| CVE-2022-41328 Fortinet FortiOS Path Traversal Vulnerability | [ MEDIUM ] | 6.7 | 10.7% | ||
| CVE-2022-42475 Fortinet FortiOS Heap-Based Buffer Overflow Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 99.5% | ||
| CVE-2021-44168 Fortinet FortiOS Arbitrary File Download | [ LOW ] | 3.3 | 0.9% | ||
| CVE-2020-12812 Fortinet FortiOS SSL VPN Improper Authentication Vulnerabilityransomware use | [ CRITICAL ] | 9.8 | 45.4% | ||
| CVE-2019-5591 Fortinet FortiOS Default Configuration Vulnerabilityransomware use | [ MEDIUM ] | 6.5 | 18.6% | ||
| CVE-2018-13379 Fortinet FortiOS SSL VPN Path Traversal Vulnerabilityransomware use | [ CRITICAL ] | 9.1 | 100.0% |
Sorted by date added to KEV. Severity and CVSS as stated by NVD or the vendor; EPSS from FIRST.org. "Patch by" is CISA's BOD 22-01 deadline for US federal agencies, a useful priority signal for everyone else. Machine-readable: /api/v1/vendors/fortinet.json.
Our Fortinet FortiOS coverage
Other Fortinet products
Every row links to its CVE record with the CISA required action, catalog coverage and primary sources. We describe impact and remediation only; no exploit code. See the full KEV tracker or compare KEV catalogs.