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CVE-2025-25249

HIGH 7.4 KNOWN EXPLOITED ALL-YEARS

Published 2026-01-13 · Last modified 2026-10-15 · fortinet · NVD: Analyzed

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

ACTIVELY EXPLOITED

Confirmed exploited in the wild — in CISA KEV since 2026-09-09. Patch or mitigate now.

Exploitation likelihood

3.7%chance of exploitation in 30 days · 90th percentile

● In CISA KEV (2026-09-09)○ Catalogued PoC◆ SSVC: exploitation active, automatable no

Impact if exploited

7.4CVSS 3.1 · HIGH · CNA

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ⚠Complexity: Needs a race window or specific setup

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Fortinet Siemens

Products Fortiswitchmanager Fortios Ruggedcom Ape1808 Fortisase Ruggedcom Ape1808 Firmware

Weakness (CWE)

  • CWE-122: Execute unauthorized code or commands
  • CWE-787: Out-of-bounds write

CVSS vector

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

References and research data (JSON)

Additional exploitation reports

Source-specific reports, separate from CISA KEV. Repeated observations from one source are not independent confirmations.

  • VulnCheck KEV · 2026-09-08T00:00:00Z

    Source guidance: 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.

    Source ransomware assessment: Unknown

    VulnCheck KEV · CVE-2025-25249 · Updated 2026-09-08T00:00:00Z
  • VulnCheck KEV · 2026-09-08T00:00:00ZVulnCheck KEV · CVE-2025-25249
  • VulnCheck KEV · 2026-09-09T00:00:00ZVulnCheck KEV · CVE-2025-25249

Known Affected Software Configurations

VendorProductVersion range
FortinetFortios≥ 6.4.0 and < 7.0.18
FortinetFortios≥ 7.2.0 and < 7.2.12
FortinetFortios≥ 7.4.0 and < 7.4.9
FortinetFortios≥ 7.6.0 and < 7.6.4
FortinetFortiswitchmanager≥ 7.0.0 and < 7.0.6
FortinetFortiswitchmanager≥ 7.2.0 and < 7.2.7
FortinetFortisase25.1.39
FortinetFortisase25.1.51
SiemensRuggedcom Ape1808 Firmware*

All CVSS metrics

  • HIGH 7.4 v3.1 · CNA Primary
    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
  • HIGH 8.1 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Exploit-tagged references (not proof of a PoC)

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · All sources and attribution · EPSS