Fortinet FortiOS SSL VPN Remote Code Execution Vulnerability (CVS 2023-27997)

Fortinet FortiOS SSL VPN Remote Code Execution Vulnerability (CVS 2023-27997)

junho 14, 2023 | NSFOCUS


Recently, NSFOCUS CERT found that Fortinet has officially fixed a remote code execution vulnerability in FortiOS SSL VPN (CVS-2023-27997). Due to the heap-based Buffer overflow error in SSL VPN, an unauthenticated attacker can trigger the vulnerability by sending a specially crafted packet, which can ultimately enable the execution of arbitrary code on the target system. Please take measures for protection as soon as possible.

Vulnerability DetailsVulnerability PoC Vulnerability EXPUtilization in the wilderness
UnpublishedUnpublishedUnpublishedNot existing

Scope of Impact

Affected version

  • FortiOS<7.2.5
  • FortiOS<7.0.12
  • FortiOS<6.4.13
  • FortiOS<6.2.15
  • FortiOS<6.0.17

Unaffected version

  • FortiOS>=7.2.5
  • FortiOS>=7.0.12
  • FortiOS>=6.4.13
  • FortiOS>=6.2.15
  • FortiOS>=6.0.17


Currently, the official security version has been released to fix this vulnerability. It is recommended that affected users upgrade their protection in a timely manner:

FortiOS versionLink


This advisory is only used to describe a potential risk. NSFOCUS does not provide any commitment or promise on this advisory. NSFOCUS and the author will not bear any liability for any direct and/or indirect consequences and losses caused by transmitting and/or using this advisory. NSFOCUS reserves all the rights to modify and interpret this advisory. Please include this statement paragraph when reproducing or transferring this advisory. Do not modify this advisory, add/delete any information to/from it, or use this advisory for commercial purposes without permission from NSFOCUS.


NSFOCUS, Inc., a global network and cyber security leader, protects enterprises and carriers from advanced cyber attacks. The company’s Intelligent Hybrid Security strategy utilizes both cloud and on-premises security platforms, built on a foundation of real-time global threat intelligence, to provide multi-layered, unified and dynamic protection against advanced cyber attacks.

NSFOCUS works with Fortune Global 500 companies, including four of the world’s five largest financial institutions, organizations in insurance, retail, healthcare, critical infrastructure industries as well as government agencies. NSFOCUS has technology and channel partners in more than 60 countries, is a member of both the Microsoft Active Protections Program (MAPP), and the Cloud Security Alliance (CSA).

A wholly owned subsidiary of NSFOCUS Technologies Group Co., Ltd., the company has operations in the Americas, Europe, the Middle East and Asia Pacific.