CVE-2025-25249Fortinet Fortios Heap-based Buffer Overflow
Vulnerability Summary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HAffected & Patched Versions
- Fortinet Fortios >= 6.4.0 and < 7.0.18
- Fortinet Fortios >= 7.2.0 and < 7.2.12
- Fortinet Fortios >= 7.4.0 and < 7.4.9
- Fortinet Fortios >= 7.6.0 and < 7.6.4
- Fortinet Fortiswitchmanager >= 7.0.0 and < 7.0.6
- Fortinet Fortiswitchmanager >= 7.2.0 and < 7.2.7
- Fortinet Fortisase
- Siemens Ruggedcom Ape1808 Firmware
- Fortinet Fortios 7.0.18
- Fortinet Fortios 7.2.12
- Fortinet Fortios 7.4.9
- Fortinet Fortios 7.6.4
- Fortinet Fortiswitchmanager 7.0.6
- Fortinet Fortiswitchmanager 7.2.7
What to do
Patch now. CISA lists this flaw as exploited in the wild and set a federal remediation deadline of Sep 12, 2026.
- Check whether you run Fortinet Fortios and which version.
- Update to a patched version listed above, then confirm the new version.
- Review logs and exposed services for signs of earlier compromise.
CISA 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 KEV Status
Remediation due: Sep 12, 2026 (deadline passed)
Timeline
- Jan 13, 2026Published
- Sep 9, 2026Added to CISA KEV catalog
- Sep 12, 2026KEV remediation due date
- Oct 7, 2026Record last modified
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
Related Coverage
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All Fortinet vulnerabilities →
External References
Data last checked: Nov 13, 2026 21:28 UTC