CVE-2026-3040

MEDIUM
2026-02-23 [email protected]
4.7
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

3
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
PoC Detected
Feb 26, 2026 - 16:11 vuln.today
Public exploit code
CVE Published
Feb 23, 2026 - 22:16 nvd
MEDIUM 4.7

Tags

Command Injection Vigor300b Firmware

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.

Analysis

Command injection in DrayTek Vigor 300B firmware up to version 1.5.1.6 allows authenticated remote attackers to execute arbitrary OS commands via the File parameter in the web management interface. Public exploit code exists for this vulnerability, though the vendor has confirmed the product is end-of-life and no patch will be released. …

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Remediation

Within 30 days: Identify affected systems running DrayTek Vigor 300B and apply vendor patches as part of regular patch cycle. Validate input sanitization for user-controlled parameters.

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Priority Score

44
Low Medium High Critical
KEV: 0
EPSS: +0.3
CVSS: +24
POC: +20

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CVE-2026-3040 vulnerability details – vuln.today
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