Actively exploited in the wild
Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
Fortinet - FortiOS and FortiProxy SSL-VPN · Listed in the CISA KEV since 2023-06-13. This indicates confirmed attacks in production environments.
Required action: Apply updates per vendor instructions.
CVE-2023-27997
CriticalCVSS 9.8KEVExploitation Probability (EPSS)
Very high risk100th percentile - higher than 100% of all known CVEs
Summary
Heap-based buffer overflow in SSL-VPN in FortiOS and FortiProxy, allowing a remote attacker to execute arbitrary code or commands via specially crafted requests.
Risk Assessment
An attacker can remotely take control of the device, potentially compromising the entire network security.
Recommendation
Immediately update FortiOS and FortiProxy to versions beyond the vulnerable ones and disable SSL-VPN if not essential.
Original NVD description (English source)
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.