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Fortinet Multiple Products' Heap-Based Buffer Overflow Allows Remote Attackers to Potentially Execute Arbitrary Code or Crash Affected Devices; CISA's September 12th KEV Deadline Has Passed

Last refreshed2026-09-27

Status: KEV  |  Advisory ID: CVE-2025-25249

Key Details

CVECVE-2025-25249
Vulnerability NameFortinet Multiple Products Heap-based Buffer Overflow Vulnerability
CVSS Score / Version8.1 (High) / CVSS v3.1
Updated2026-09-20
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Proseattack vector is network; attack complexity is high; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected productsFortinet Multiple Products, Fortinet FortiOS, Fortinet FortiSwitchManager, Fortinet FortiSASE, and Siemens RUGGEDCOM APE1808 Firmware
Exploitation statusListed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation.
Classified asCWE-122 (Heap-based Buffer Overflow)
KEV listingAdded to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-09-09.
Exploitation prediction (EPSS)3.86% probability of exploitation in the next 30 days (90% percentile) -- FIRST.org's EPSS model.
Federal remediation deadline2026-09-12 (CISA KEV, Binding Operational Directive).

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
FortinetMultiple Products
FortinetFortiOS
FortinetFortiSwitchManager
FortinetFortiSASE
SiemensRUGGEDCOM APE1808 Firmware
SubsystemsCore Infrastructure, Industrial Network - Routers/Firewalls, PLC/PAC/RTU
SectorsCritical Manufacturing, Energy, Food and Agriculture, Multi-sector, Transportation Systems

What to Know

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

What to Do

Monitor Fortinet's and Siemens's web pages for any future patch releases. See vendor advisory link below.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2025-25249
CVEhttps://www.cve.org/CVERecord?id=CVE-2025-25249
Vendor advisoryhttps://fortiguard.fortinet.com/psirt/FG-IR-25-084

KEV Required Action

FieldValue
KEV Linkhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog
Date Added to KEV2026-09-09
Required Action Due Date2026-09-12
Required ActionApply 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.

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