Buffer overflow in Fortinet Fortios
CVE-2025-25249
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 class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.038 (89.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.024 · newest: 0.038 · change: +0.014
Affected products
- Fortinet Fortios — versions 7.6.0, 7.4.0, 7.2.4
- Fortinet Fortisase — versions 25.1.39, 25.1.51
- Fortinet Fortiswitchmanager — versions 7.2.2
- Siemens Ruggedcom Ape1808 Firmware
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
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.
References
- https://fortiguard.fortinet.com/psirt/FG-IR-25-084 (Mitigation, Vendor Advisory)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e (Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Exploit, Third Party Advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2025-25249?
- CVE-2025-25249 is a high-severity vulnerability in Fortinet Fortios, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-01-13.
- How severe is CVE-2025-25249?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2025-25249 known to be exploited?
- Yes. CVE-2025-25249 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-09-09), indicating it is being actively exploited.