CVE-2026-3040CWE-77CWE-78

DrayTek Vigor 300B Web Management uploadlangs cgiGetFile os command injection

Medium · published February 23, 2026

CVSS v4.0
5.1
EPSS
8%
Percentile
94.8
In the wild
Unconfirmed
What it is

A vulnerability was identified 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. The attack may be initiated remotely. The exploit is publicly available and might be used. The vendor confirms that "300B is EoL, and this is an authenticated vulnerability. We don't plan to fix it." This vulnerability only affects products that are no longer supported by the maintainer.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.07993 · 94.8th percentile
Weaknesses
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection'); CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-02-23T22:02Z
EPSS history
Timeline
  • 23 FEB 22:02Z
    DrayTek Vigor 300B Web Management uploadlangs cgiGetFile os command injection
    cvelistv5