CVE-2023-27997

9.8 criticalKEVEPSS 86%

Critical (9.8) in Fortinet FortiOS and FortiProxy SSL-VPN. In CISA KEV since 2023-06-13, with known ransomware use. EPSS 86% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 86% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CISA KEV: listed 2023-06-13, due 2023-07-04, known ransomware use
CWEs: CWE-787, CWE-122
Published: 2023-06-13
Modified: 2026-07-31
Record from: the NVD, synced 2026-10-19

Affected

fortinet:fortios
fortinet:fortiproxy

References

Check your stack JSON