Actively exploited in the wild
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
Fortinet - Multiple Products · Listed in the CISA KEV since 2026-09-09. This indicates confirmed attacks in production environments.
Required action: 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.
CVE-2025-25249
HighCVSS 8.1KEVExploitation Probability (EPSS)
High risk90th percentile - higher than 90% of all known CVEs
Summary
A heap-based buffer overflow vulnerability in Fortinet FortiOS and FortiSwitchManager allows an attacker to execute unauthorized code or commands via specially crafted packets. This affects FortiOS versions from 7.0.0 to 7.6.3 and FortiSwitchManager from 7.0.0 to 7.2.6.
Risk Assessment
This vulnerability poses a serious risk to organizations, allowing attackers to remotely execute code, potentially compromising systems and data.
Recommendation
It is recommended to upgrade to the latest version of FortiOS and FortiSwitchManager to mitigate this vulnerability and to monitor network traffic for potential attacks.
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Original NVD description (English source)
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
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

