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CVE-2025-25249

Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

  • High 7.4
  • Exploited: added to CISA KEV 9 Sep 2026

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

Key facts

Published
13 Jan 2026
Last changed
15 Oct 2026
Assigned by
fortinet
KEV added
9 Sep 2026
KEV fix due
12 Sep 2026
EPSS
3.742% likely to be exploited in the next 30 days, higher than 90.033% of CVEs (scores for 15 Nov 2026)
SSVC (CISA)
Exploitation: active; Automatable: no; Technical impact: total

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 7.4CVSS 3.1, Highfrom the CNA (fortinet)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:W/RC:C

What to do

  • Upgrade to FortiSwitchManager version 7.2.7 or above Upgrade to FortiSwitchManager version 7.0.6 or above Fortinet remediated this issue in FortiSASE version 25.2.c and hence customers do not need to perform any action. Fortinet remediated this issue in FortiSASE version 25.1.b and hence customers do not need to perform any action. Upgrade to upcoming FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.4 or above Upgrade to FortiOS version 7.4.9 or above Upgrade to FortiOS version 7.2.12 or above Upgrade to FortiOS version 7.0.18 or aboveCNA solution statement
  • 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.CISA KEV required action

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
FortinetFortiSwitchManager
  • Default status: unaffected
  • 7.2.2 up to and including 7.2.5 (affected)
FortinetFortiOS
  • Default status: unaffected
  • 7.6.0 up to and including 7.6.2 (affected)
  • 7.4.0 up to and including 7.4.7 (affected)
  • 7.2.4 up to and including 7.2.11 (affected)

Timeline

  1. 13 Jan 2026 Published
  2. 9 Sep 2026 Added to the CISA KEV catalogue

Weakness

References