CVE-2026-3040 | DrayTek Vigor 300B up to 1.5.1.6 Web Management Interface uploadlangs cgiGetFile os command injection
A vulnerability marked as critical has been reported in DrayTek Vigor 300B up to 1.5.1.6. This affects the function cgiGetFile of the file /cgi-bin/mainfunction.cgi/uploadlangs of the component Web Management Interface. The manipulation of the argument File leads to os command injection. This vulnerability only affects products that are no longer supported by the maintainer.
This vulnerability is listed as CVE-2026-3040. The attack may be initiated remotely. In addition, an exploit is available.
The vendor confirms that "300B is EoL, and this is an authenticated vulnerability. We don't plan to fix it."