Fortinet FortiClientEMS: Schwachstelle ermöglicht Codeausführung
WID-SEC-2026-0343 · first 09.02.2026 · updated 31.03.2026 · CVSS 9,8
What it is about
FortiClient ist ein Endgeräteschutz mit einem integrierten VPN-Client. Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Fortinet FortiClientEMS ausnutzen, um eine SQL-Injection durchzuführen und so beliebigen Code 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
- eine SQL-Injection durchzuführen
- so beliebigen Code auszuführen
Am I affected?
Affected according to the BSI:
- Fortinet FortiClient EMS <7.4.5
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Update to at least:
- Fortinet FortiClient EMS 7.4.5
Is the vulnerability already being exploited?
- CVE-2026-21643: exploited in the wild according to CISA, in the catalogue since 13.04.2026.
Information and sources
- Original BSI advisory (WID)
- Fortinet Security Advisory vom 2026-02-08 fortiguard.fortinet.com
- PoC vom 2026-03-18 bishopfox.com
CVE: CVE-2026-21643
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.