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CVE-2026-3040

DrayTek Vigor 300B Web Management uploadlangs cgiGetFile os command injection

Published: Feb 23, 2026Updated: Apr 29, 2026 Sources: CVE List NVDCWE-77
NVD MITRE
4.7CVSSMEDIUM
EPSS Score
9.1%
Top 5.4%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-77CWE-78

Affected Products

vigor300b firmwaredraytekNetworking Infrastructure
Vigor 300BDrayTekNetworking Infrastructure
draytekcommercialTWNetworking Infrastructureaka draytek corp.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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MITRE ATT&CK

1 technique
Execution
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References

https://github.com/master-abc/cve/issues/42
github.com
https://vuldb.com/?ctiid.347394
vuldb.com
https://vuldb.com/?id.347394
vuldb.com
and 1 more references View all →

Timeline

Published
Feb 23, 2026
Last Updated
Apr 29, 2026

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