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CVE-2025-53843

FortiOS - Firewall

Fortinet CVSS 7.5 Updated March 16, 2026

Executive Risk Summary

"A stack-based buffer overflow vulnerability in Fortinet FortiOS allows an attacker to execute unauthorized code or commands via specially crafted packets, potentially leading to a complete system compromise. This vulnerability affects multiple versions of FortiOS, including 7.6.0 through 7.6.3, 7.4.0 through 7.4.8, and all versions of 7.2 and 7.0, as well as 6.4."

Operational Audit Arsenal

Target Type Firmware Image
Target Asset FortiOS
Standard Path Global Firmware

Manual Verification Required

This is a non-Windows asset (Fortinet). Use the target asset details above to verify your version against vendor advisories.

Patch Impact Forecast

Reboot Required Likely

High

Internal Work Notes

FortiOS vulnerability CVE-2025-53843 - Potential for unauthorized code execution via buffer overflow, requiring immediate patching and reboot of affected firewalls.

Technical Intelligence & Operational Utilities • Delivered Weekly

Intelligence Sources

Scope of Impact

Fortinet Fortios

Original NVD Description

"A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions allows attacker to execute unauthorized code or commands via specially crafted packets"

Related Fortinet Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.