CVE-2025-25249: Fortinet Multiple Products

What is 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

CVSS9.8 NVD 3.1

SeverityCRITICAL

Exploitation In the wild In CISA KEV

EPSS1% · P53

Triage statusActive Exploit

ActionPatch immediately

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWECWE-122, CWE-787

NVD published2026-01-13

NVD last modified2026-09-10

Timeline

2026-01-13Published to the U.S. National Vulnerability Database (NVD)
2026-09-09Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-10NVD record last updated
2026-09-12CISA federal remediation deadline (BOD 22-01)

CISA Known Exploited Vulnerability

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

Added to KEV2026-09-09

Federal patch deadline2026-09-12

Known ransomware useUnknown

Affected product

Fortinet Multiple Products

NVD also lists CPE entries for: Fortinet Fortios, Fortinet Fortiswitchmanager, Fortinet Fortisase

Remediation Steps

Identify systems affected by CVE-2025-25249 using vulnerability scanning tools
Apply vendor patches according to the vendor's published security advisory
Verify patch installation across all affected systems

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)

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🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.