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CriticalKEV

CVE-2025-25249 — Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability

CVE-2025-25249 · FortiOS · CVSS 9.8 · KEV

In brief

Severity · CVSS
Critical9.8CVSS 3.1, Critical
EPSS
4%
CISA KEV
Known exploited, listed since 9 Sept 2026
Vendor
Fortinet
Products
FortiOS
Published · Modified
·
Last verified

Summary

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

Weakness: CWE-122, CWE-787

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

6 branches with a published fixed release · 1 branch to migrate

Fortinet FortiSwitchManager

Source: FG-IR-25-084CVE-2025-25249

  1. 7.2
    Affected versions7.2.2 – 7.2.5
    First fixed release7.2.7
  2. 7.0
    Affected versions7.0.0 – 7.0.5
    First fixed release7.0.6

Releases the vendor does not list are not affected.

Fortinet FortiOS

Source: FG-IR-25-084CVE-2025-25249

  1. 7.6
    Affected versions7.6.0 – 7.6.2
    First fixed release7.6.4
  2. 7.4
    Affected versions7.4.0 – 7.4.7
    First fixed release7.4.9
  3. 7.2End of life
    Affected versions7.2.4 – 7.2.11
    First fixed release7.2.12
  4. 7.0End of life
    Affected versions7.0.0 – 7.0.17
    First fixed release7.0.18
  5. 6.4End of life
    Affected versionsAll releases of the branch
    First fixed releaseMigration to a fixed release required

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • FortiSwitchManager 7.27.2.7
  • FortiSwitchManager 7.07.0.6
  • FortiOS 7.67.6.4
  • FortiOS 7.47.4.9
  • FortiOS 7.27.2.12
  • FortiOS 7.07.0.18

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Branches without a fix of their own: migrate to a fixed release

  • FortiOS 6.4

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.

Full text

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 above

SourceFortinet (CVE record)

SourceFortiGuard FG-IR-25-084

CISA KEV 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).

Full CISA action

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 due date:

SourceCISA KEV

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0035

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Added to CISA KEV on 9 Sept 2026

Federal remediation due date: 12 Sept 2026

The CISA required action is shown under Remediation.

4% probability of exploitation in the next 30 days (percentile 90%).

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

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0035Published 14 Jan 2026

Multiple vulnerabilities in Fortinet products

Remote arbitrary code executionSQL injection (SQLi)Server-side request forgery (SSRF)Security policy bypassData confidentiality breach

Summary

Multiple vulnerabilities have been discovered in Fortinet products. Some of them allow an attacker to cause remote arbitrary code execution, a data confidentiality breach, and SQL injection (SQLi).

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:04 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Added to CISA KEV
  3. Source record last modified
  4. CISA remediation due date
  5. EPSS score computed
  6. Last verified by Patcharo

Official sources

References

Known exploited

Fortinet · CISA Known Exploited Vulnerabilities · NVD · FIRST EPSS · FortiGuard FG-IR-25-084

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: FortiOS version numbering: branches, patch releases and the Feature and Mature labels

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-71407A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6 m…High
  • CVE-2025-53844A out-of-bounds write vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, For…High
  • CVE-2025-53847A missing authentication for critical function vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS…High
  • CVE-2025-68686Fortinet FortiOS Exposure of Sensitive Information to an Unauthorized Actor VulnerabilityMediumKEV
  • CVE-2025-64157A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7…High

All FortiOS vulnerabilitiesAll Fortinet vulnerabilities