CVE-2023-27997—Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

Vulnerability Name

Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

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.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

KNOWN

Action

Apply updates per vendor instructions.

Additional Notes

• https://www.fortiguard.com/psirt/FG-IR-23-097
• https://nvd.nist.gov/vuln/detail/CVE-2023-27997

Related News Articles

• Hackers now exploiting critical Fortinet FortiSIEM flaw in attacksJanuary 16, 2026
• Over 10K Fortinet firewalls exposed to actively exploited 2FA bypassJanuary 2, 2026
• Critical Fortinet flaws now exploited in Qilin ransomware attacksJune 6, 2025
• Fortinet Warns Attackers Retain FortiGate Access Post-Patching via SSL-VPN Symlink ExploitApril 11, 2025
• Hackers exploit old FortiGate vulnerabilities, use symlink trick to retain limited access to patched devicesApril 11, 2025

Related Weaknesses

• CWE-122