Actively exploited
Listed in CISA’s Known Exploited Vulnerabilities catalog since September 9, 2026.
CVE-2025-25249
Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
Added to KEV September 9, 2026
Alert details
- Source feed
- CISA KEV
- CVE ID
- CVE-2025-25249
- CWE
- CWE-122CWE-787
- Affected products
- Multiple Products · Fortinet Multiple Products · Fortinet
What happened
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.
What it means for your business
Fortinet Multiple Products is listed in CISA's Known Exploited Vulnerabilities catalog (CVE-2025-25249). 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. CISA remediation due date: 2026-09-12. If you need help checking exposure, call (864) 335-9223.
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.
CISA due date: September 12, 2026
Sources
Related briefs
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