CVE-2025-25249
9.8, critical Known exploitedFortinet Multiple Products Heap-based Buffer Overflow Vulnerability
- CVSS
- 9.8, critical critical CVSS v3.1
- EPSS, next 30 days
- 4% higher than 89.8% of scored CVEs
- Exploitation
- Confirmed in the wild
- Published
- 13 Jan 20269 months ago
Known exploited
CISA added this to the Known Exploited Vulnerabilities Catalog on 9 Sept 2026. US federal agencies had to remediate by 12 Sept 2026, a deadline that has passed.
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.
Description
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
Details
- Vendor
- Fortinet and 1 more
- Product
- FortiSwitchManager
- Weakness
- CWE-122 (opens in a new tab)
- Status
- Analyzed
- Updated
- 7 Oct 2026
- Assigner
- psirt@fortinet.com
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References 4
Advisories 2
The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.
Other Fortinet CVEs
Every Fortinet CVE we holdSame vendor in what we hold, not a known link between the flaws.
- CVE-2026-104286 Fortinet FortiMail Path Traversal Vulnerability KEV EPSS 2% 9.8, critical
- CVE-2026-25089 Fortinet FortiSandbox OS Command Injection Vulnerability KEV EPSS 76% 9.8, critical
- CVE-2026-39808 Fortinet FortiSandbox OS Command Injection Vulnerability KEV EPSS 47% 9.8, critical
- CVE-2025-61624 Fortinet Multiple Products Path Traversal Vulnerability KEV EPSS 0.6% 6.5, medium
- CVE-2026-35616 Fortinet FortiClient EMS Improper Access Control Vulnerability KEV EPSS 9% 9.8, critical
- CVE-2025-68686 Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor Vulnerability KEV EPSS 29% 5.9, medium
- CVE-2026-21643 Fortinet FortiClient EMS SQL Injection Vulnerability KEV EPSS 94% 9.8, critical
- CVE-2026-24858 Fortinet Multiple Products Authentication Bypass Using an Alternate Path or Channel Vulnerability KEV EPSS 86% 9.8, critical
Beyond this page
Is CVE-2025-25249 in your network?
This page tells you how dangerous CVE-2025-25249 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.
CVE-2025-25249 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.
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EXYS7600 OCELOT
Find it before attackers do
Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2025-25249 comes with the devices to patch.
Learn more about EXYS7600 OCELOT -
EXYS7950 KONDRA
Detect it if it's exploited
Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.
Learn more about EXYS7950 KONDRA
Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 18 Oct 2026, not the live upstream state.