Fortinet FortiOS: Schwachstelle ermöglicht Codeausführung
WID-SEC-2026-0085 · first 14.01.2026 · updated 10.09.2026 · CVSS 8,1
What it is about
FortiOS ist ein gehärtetes Betriebssystem für FortiGate Plattformen. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Fortinet FortiOS ausnutzen, um beliebigen Programmcode auszuführen.
Under what conditions?
Over the network and without logging in. This is the most dangerous combination: attackers can scan reachable devices automatically.
What can happen in the worst case
An attacker could use the vulnerability to
- beliebigen Programmcode auszuführen
Am I affected?
Affected according to the BSI:
- Fortinet FortiOS <7.2.12
- Fortinet FortiOS <7.4.9
- Fortinet FortiOS <7.6.4
- Fortinet FortiOS <7.0.18
- Fortinet FortiOS <6.4.17
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Fortinet FortiOS 7.2.12
- Fortinet FortiOS 7.4.9
- Fortinet FortiOS 7.6.4
- Fortinet FortiOS 7.0.18
- Fortinet FortiOS 6.4.17
Is the vulnerability already being exploited?
- CVE-2025-25249: exploited in the wild according to CISA, in the catalogue since 09.09.2026.
Information and sources
- Original BSI advisory (WID)
- FortiGuard PSIRT Advisory FG-IR-25-084 vom 2026-01-13 www.fortiguard.com
- Exploit socradar.io
CVE: CVE-2025-25249
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.