Is CVE-2026-3040 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2026-3040, but active exploitation has not been confirmed.

Can CVE-2026-3040 be exploited remotely?

Yes. CVE-2026-3040 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-3040?

CVE-2026-3040 has a CVSS score of 7.2 (HIGH) and an EPSS exploitation probability of 0.30%.

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HIGHPOC

CVE-2026-3040

CWE-77Published: February 23, 2026· Updated: Feb 26, 2026

7.2

CVSS v3.1

EPSS:0.30%probability of exploitation in 30 daysPercentile:52.7th

Official Description

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.

NVD Source

Technical Analysis

CVE-2026-3040 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.2.

A proof-of-concept (PoC) exploit exists for CVE-2026-3040. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.