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Vulnerability record · CVE-2026-3040 · published 23 February 2026

CVE-2026-3040: Draytek vigor300b firmware command injection vulnerability

Draytek · Vigor300b Firmware

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.

2.0 CVSS 4.0 Low EPSS 7.2% · top 5.9% CWE-77 · Command injectionCWE-78 · OS command injection
2.0CVSS 4.0 base score, v2 5.8
7.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/master-abc/cve/issues/42 ExploitIssue Tracking
https://vuldb.com/?ctiid.347394 Permissions RequiredThird Party AdvisoryVDB Entry
https://vuldb.com/?id.347394 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.757126 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-15415DrayTek Vigor routers OS command injection in cvmcfguploadDrayTek Vigor3900, Vigor2960 and Vigor300B devices before firmware 1.5.1 allow OS command injection through shell metacharacters in a filename upload…KEVEPSS 84%analysed9.8CVE-2020-8515DrayTek Vigor routers unauthenticated OS command injection in web managementDrayTek Vigor2960, Vigor3900 and Vigor300B firmware pass shell metacharacters to cgi-bin/mainfunction.cgi, allowing OS command injection. Because the…KEVEPSS 100%analysed6.9CVE-2024-12987DrayTek Vigor router web interface OS command injectionDrayTek Vigor2960 and Vigor300B firmware 1.5.1.4 contain an OS command injection flaw in the /cgi-bin/mainfunction.cgi/apmcfgupload endpoint of the w…KEVEPSS 98%analysed9.8CVE-2021-42911Draytek vigor2960 firmware vulnerabilityA Format String vulnerability exists in DrayTek Vigor 2960 <= 1.5.1.3, DrayTek Vigor 3900 <= 1.5.1.3, and DrayTek Vigor 300B <= 1.5.1.3 in the mainfu…EPSS 3.5%9.8CVE-2021-43118Draytek vigor2960 firmware command injection vulnerabilityA Remote Command Injection vulnerability exists in DrayTek Vigor 2960 1.5.1.3, DrayTek Vigor 3900 1.5.1.3, and DrayTek Vigor 300B 1.5.1.3 via a craft…EPSS 35%9.8CVE-2020-14473Draytek vigor300b firmware out-of-bounds write vulnerabilityStack-based buffer overflow vulnerability in Vigor3900, Vigor2960, and Vigor300B with firmware before 1.5.1.1.EPSS 2.3%9.8CVE-2020-14472Draytek vigor300b firmware command injection vulnerabilityOn Draytek Vigor3900, Vigor2960, and Vigor 300B devices before 1.5.1.1, there are some command-injection vulnerabilities in the mainfunction.cgi file.EPSS 2.9%9.8CVE-2020-14993Draytek vigor300b firmware out-of-bounds write vulnerabilityA stack-based buffer overflow on DrayTek Vigor2960, Vigor3900, and Vigor300B devices before 1.5.1.1 allows remote attackers to execute arbitrary code…EPSS 5.3%

Source: NIST National Vulnerability Database (record CVE-2026-3040), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.