CVE-2025-25249

Critical

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

9.8 CVSS v3.1

Published: Jan 13, 2026
Updated: Oct 7, 2026
Vendor: Fortinet, Siemens
Affected versions: See affected products
Weakness: CWE-122, CWE-787

Summary

A heap-based buffer overflow vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2.0 through 7.2.11, FortiOS 7.0.0 through 7.0.17, FortiOS 6.4 all versions, FortiSwitchManager 7.2.0 through 7.2.6, FortiSwitchManager 7.0.0 through 7.0.5 allows attacker to execute unauthorized code or commands via specially crafted packets

Severity

Critical (9.8)

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet Fortios >= 6.4.0, < 7.0.18
Fortinet Fortios >= 7.2.0, < 7.2.12
Fortinet Fortios >= 7.4.0, < 7.4.9
Fortinet Fortios >= 7.6.0, < 7.6.4
Fortinet Fortiswitchmanager >= 7.0.0, < 7.0.6
Fortinet Fortiswitchmanager >= 7.2.0, < 7.2.7
Fortinet Fortisase 25.1.39
Fortinet Fortisase 25.1.51
Siemens Ruggedcom Ape1808 Firmware

Exploitation status

Actively exploited

Listed in the CISA Known Exploited Vulnerabilities catalog on Sep 9, 2026. Federal remediation due: Sep 12, 2026.

Technical details

Technical analysis has not been written for this record yet.

Mitigation & remediation

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.