Stack-Based Buffer Overflow in Fortinet FortiOS Products
CVE-2025-53843

6.9MEDIUM

Key Information:

Vendor

Fortinet
Status
FortiOS
Vendor
CVE Published:
18 November 2025

What is CVE-2025-53843?

A stack-based buffer overflow vulnerability in Fortinet's FortiOS products enables attackers to execute unauthorized code or commands by sending specially crafted packets. This can compromise the affected systems, allowing for potential data breaches or unauthorized access. It is critical for users of FortiOS versions 7.6.0 through 7.6.3, as well as earlier versions, to apply security updates to mitigate this risk.

Affected Version(s)

FortiOS 7.6.0 <= 7.6.3

FortiOS 7.4.0 <= 7.4.8

FortiOS 7.2.0 <= 7.2.12

References

https://fortiguard.fortinet.com/psirt/FG-IR-25-358

CVSS V3.1

Score:
6.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
.
CVE-2025-53843 : Stack-Based Buffer Overflow in Fortinet FortiOS Products