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Vulnerability · Published Feb 23, 2026 · Assigned by VulDB

CVE-2026-3040DrayTek Vigor 300B Web Management uploadlangs cgiGetFile os command injection

Medium 4.7

In plain English

A medium-severity OS command injection in Vigor 300B from DrayTek. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 10.1% (higher than 96% of all known vulnerabilities).

Severity (CVSS 3.1)4.7Medium
Exploit odds (30 days)10.1%top 4.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

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.

Affected products (as reported)

VendorProductVersions
DrayTek Vigor 300B 1.5.1.01.5.1.11.5.1.21.5.1.31.5.1.41.5.1.51.5.1.6

Weakness: CWE-78, CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References