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CVE-2025-25249

Fortinet Multiple Products•CRITICAL · CVSS 9.8• In the wild In CISA KEV

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

EPSS4% · P90

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 modified2026-10-07

Timeline

2026-01-13Published to the U.S. National Vulnerability Database (NVD)
2026-09-09Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
2026-09-11First covered in a defend.network daily briefing
2026-09-12CISA federal remediation deadline (BOD 22-01)
2026-10-07NVD record last updated

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, Siemens Ruggedcom Ape1808 Firmware, Siemens Ruggedcom Ape1808

Remediation Steps

Apply the vendor security update for Fortinet Multiple Products as a priority.
Restrict network exposure of the affected service to trusted sources until patched.
Review logs and detections for indicators of exploitation.
Confirm fixed versions against the official vendor advisory before deploying.

References

Referenced in our briefings & reports

Vulnerability Priority Report – Week 1 of October 2026 (October 5 – 11)
Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
Vulnerability Priority Report – Week 2 of September 2026 (September 14 – 20)
Vulnerability Priority Report – Week 1 of September 2026 (September 7 – 13)
Android malware surge; AI-powered PaperCut campaign hits 395+ orgs (2026-09-11)

Related vulnerabilities

CVE-2025-61624 – Fortinet Multiple Products (same product)
CVE-2026-0257 – Palo Alto Networks PAN-OS (same product)
CVE-2025-68686 – Fortinet FortiOS (same product)
CVE-2026-53362 – Linux Kernel (same vendor)
CVE-2026-110936 – Siemens Software Center (same vendor)
CVE-2026-104286 – Fortinet FortiMail (same vendor)

Fortinet: 32 known exploited vulnerabilities (CISA KEV) →

Browse all tracked CVEs in the defend.network CVE database →

🤖 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.