Fortinet Multiple Products Heap-based Buffer Overflow Vulnerability
- Severity
- Critical9.8CVSS 3.1, Critical
- EPSS
- 4%
- Published
- 13 Jan 2026
- Updated
- 10 Sept 2026
Description
Title, description and vendor guidance are quoted from the source records.
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
Known exploited
Added to CISA KEV on 9 Sept 2026
Federal remediation due date: 12 Sept 2026
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). 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.
Exploit prediction
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
What the source states, per branch
Versions matched by Patcharo
Fortinet FortiOSSource: Fortinet (CVE record)
| Branch | Affected | Fixed in |
|---|---|---|
| 7.6 | 7.6.0 – 7.6.2 | Fixed after 7.6.2 |
| 7.4 | 7.4.0 – 7.4.7 | Fixed after 7.4.7 |
| 7.2 | 7.2.4 – 7.2.11 | Fixed after 7.2.11 |
Versions not listed are stated unaffected by the vendor.
Affected products
- Fortinet FortiSwitchManager · 7.2.2 ≤ 7.2.5
Workaround / Vendor remediation
Vendor remediation · FortiOS
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 above
References
- https://fortiguard.fortinet.com/psirt/FG-IR-25-084(opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-864900.html(opens in a new tab)
- https://socradar.io/blog/cve-2025-25249-pivotc2-fortigate-rat/(opens in a new tab)
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-25249(opens in a new tab)
Provenance
Every fact on this page comes from the sources below. Nothing is written by an AI.
- Fortinet (CVE record)
- Fortinet (CVE record) · 27 Sept 2026, 23:46 UTC · Parser patcharo-cve5/1.1.0
- CISA Known Exploited Vulnerabilities
- CISA Known Exploited Vulnerabilities · 27 Sept 2026, 23:42 UTC · Parser patcharo-kev/1.0.0
- NVD
- NVD · 27 Sept 2026, 23:44 UTC · Parser patcharo-nvd/1.0.0
- FIRST EPSS
- FIRST EPSS · 27 Sept 2026, 23:46 UTC · Parser patcharo-epss/1.0.0
Last verified: 28 Sept 2026, 02:31 UTC