ACTIVELY EXPLOITED
CVE-2025-25249: Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
| Vendor | Fortinet |
|---|---|
| Product | Multiple Products |
| Actively exploited | Yes |
| Added to CISA KEV | 9 Sep 2026 |
| CISA federal deadline | 12 Sep 2026 |
| Weakness (CWE) | CWE-122, CWE-787 |
Required action (CISA's text)
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.
Description (NVD)
Fortinet FortiOS, FortiSwitchManager, and FortiSASE contain a heap-based buffer overflow vulnerability that allows an attacker to execute unauthorized code or commands via specially crafted packets.
SOURCES
Other Fortinet flaws
- CVE-2025-61624: Fortinet Multiple Products Path Traversal Vulnerability
- CVE-2026-104286: Fortinet FortiMail Path Traversal Vulnerability
- CVE-2025-68686: Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
- CVE-2026-39808: Fortinet FortiSandbox OS Command Injection Vulnerability
- CVE-2026-25089: Fortinet FortiSandbox OS Command Injection Vulnerability
Data from NVD, CISA KEV, FIRST EPSS and vendor advisories. Updated 10 Nov 2026.