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
2026-09-16) - NVD CVSS v3.1
- 9.8 (CRITICAL)
- 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.
NVD description
A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.