June 13, 2023 · Applied Cybernetics Group
CVE-2023-27997 — Fortinet FortiOS and FortiProxy SSL-VPN
known ransomware use
Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
- Added to KEV
2023-06-13- Federal due date
2023-07-04- Vendor
- Fortinet
- Product
- FortiOS and FortiProxy SSL-VPN
- EPSS
- 99.7th percentile (score 0.857, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Known
- ATT&CK
- T1136 , T1190 , T1574 · signal rollup
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-27997
CISA short description
Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to execute code or commands via specifically crafted requests.
Required action
Apply updates per vendor instructions.