CVE WatchSep 10, 2026

CVE-2025-25249

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

CVSS

8.1

High

EPSS

0.8%

p53

KEV

YES

Sep 9, 2026

Exploit Today

0-100

Published: Jan 13, 2026 · Last modified: Sep 10, 2026 · CWE-122 · CWE-787

EPSS · 30d

0.8%EPSS · 30 days0.8%

2026-08-122026-09-09

KEV catalog record

Product

Fortinet / Multiple Products

Vulnerability

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

Added to KEV

Sep 9, 2026

Remediate by

Sep 12, 2026

Known ransomware use

Summary description

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.

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.

Notes

https://fortiguard.fortinet.com/psirt/FG-IR-25-084 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2025-25249

Technical 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

Official references

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—

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