What is CVE-2026-3040?

CVE-2026-3040 is a medium-severity vulnerability in Draytek Vigor 300b, classified under Command Injection. CVSS score: 4.7/10. Published 2026-02-23.

How severe is CVE-2026-3040?

Medium severity. CVSS v3 base score is 4.7 out of 10.

RCE in Draytek Vigor 300b

CVE-2026-3040

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 lea…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.091 (94.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.

Affected products

Draytek Vigor 300b — versions 1.5.1.0, 1.5.1.1, 1.5.1.2
Draytek Vigor300b
Draytek Vigor300b_firmware

Weakness classification (CWE)

References

cna@vuldb.com (technical-description, VDB Entry, Third Party Advisory, vdb-entry)
cna@vuldb.com (signature, Permissions Required, permissions-required, VDB Entry, Third Party Advisory)
cna@vuldb.com (VDB Entry, Third Party Advisory, third-party-advisory)
cna@vuldb.com (issue-tracking, Exploit, exploit, Issue Tracking)

Frequently asked questions

What is CVE-2026-3040?: CVE-2026-3040 is a medium-severity vulnerability in Draytek Vigor 300b, classified under Command Injection. CVSS score: 4.7/10. Published 2026-02-23.
How severe is CVE-2026-3040?: Medium severity. CVSS v3 base score is 4.7 out of 10.