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CVEs Live

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

Fortinet · Multiple Products

Listed by CISA as exploited in the wild since 9 Sep 2026. Below: exploitation status, EPSS and every published CVSS, each with its source, then affected versions and references.

Build snapshot collected · KEV catalog 2026.10.02 · EPSS of 2 Oct 2026 · not a live feed: collected once, at build time

Description

as written by CISA (KEV catalog)

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

CISA KEV

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.

Affected products and versions

CVE record · fortinet

  • Fortinet · FortiSwitchManager

    • affected: from 7.2.2 through 7.2.5

  • Fortinet · FortiOS

    • affected: from 7.6.0 through 7.6.2
    • affected: from 7.4.0 through 7.4.7
    • affected: from 7.2.4 through 7.2.11

Status words (affected, unaffected, unknown) and version bounds are copied from the record. An upper bound such as “before 7.1.0” usually marks the first fixed version; confirm in the vendor advisory before planning an upgrade.

References

CISA KEV notes and CVE record

EPSS over the last 30 days

See also: all Fortinet entries in KEV · the full KEV catalog

Related entries

Other Fortinet entries in KEV

Added in the same week (see the week)

Questions about CVE-2025-25249

Is CVE-2025-25249 being exploited?

Yes, according to CISA. CVE-2025-25249 was added to the Known Exploited Vulnerabilities catalog on 9 Sep 2026, which CISA does only with reliable evidence of exploitation in the wild. The catalog field for ransomware campaign use says "Unknown".

What is the deadline to remediate CVE-2025-25249?

CISA set 12 Sep 2026 as the due date for US Federal Civilian Executive Branch agencies. The date is binding only for those agencies; other organisations can read it as a measure of urgency.

What is the EPSS score of CVE-2025-25249?

3.86%, in the 90th percentile, in the FIRST EPSS model of 2 Oct 2026. It estimates the probability of exploitation activity in the following 30 days. For a CVE already in KEV the score is secondary: exploitation has been observed.

How severe is CVE-2025-25249?

NVD rates it 9.8 CRITICAL (CVSS 3.1); fortinet.com rates it 8.1 HIGH (CVSS 3.1). These are the published assessments as of 3 Oct 2026; this site does not rescore.

Which product does CVE-2025-25249 affect?

Fortinet Multiple Products, as named in the CISA catalog. The affected versions listed in the CVE record are on this page; the vendor advisory in the references is the authority on fixed versions.

Related sections