CVE-2026-113391: DrayTek Vigor2960 Upload Endpoint mainfunction.cgi uploadlangs command injection

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 28 Oct 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

2.1%

EPSS score, percentile 81.3 of all scored records. A probability estimated by FIRST, not a report of exploitation.

CISA's SSVC assessment in the CVE record lists exploitation as poc.

How severe?

9.4 Critical

CVSS v4.0 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Affected

• 1.5.1.6 Revision 8218

Unaffected 1.5.1.7

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 29 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-29_0000Z, as of 29 Oct 2026. About the data.

What to do

Advisories and patches

• fw.draytek.com.tw (Patch)

Affected products and versions

As listed in the CVE record.

Versions the record lists as unaffected: 1.5.1.7.

Source: CVE List V5 (CVE Program), cve_2026-10-29_0000Z, as of 29 Oct 2026. About the data.

About this vulnerability

A vulnerability has been found in DrayTek Vigor2960 1.5.1.6 Revision 8218. This affects the function uploadlangs of the file /cgi-bin/mainfunction.cgi of the component Upload Endpoint. Such manipulation leads to command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.5.1.7 is able to mitigate this issue. It is re…

Summary: CVE record, as of 29 Oct 2026.

• CISA has not added CVE-2026-113391 to its Known Exploited Vulnerabilities (KEV) catalog, as of 28 Oct 2026.
• The CVE record was published on 20 Oct 2026.
• The CVE record carries a CVSS v4.0 base score of 9.4 (Critical), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 2.1% (percentile 81.3), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
• CISA's SSVC assessment in the CVE record: exploitation poc, automatable no, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-29_0000Z, as of 29 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 29 Oct 2026. About the data.

Description

DrayTek Vigor2960 Upload Endpoint mainfunction.cgi uploadlangs command injection

A vulnerability has been found in DrayTek Vigor2960 1.5.1.6 Revision 8218. This affects the function uploadlangs of the file /cgi-bin/mainfunction.cgi of the component Upload Endpoint. Such manipulation leads to command injection. The attack can be executed remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.5.1.7 is able to mitigate this issue. It is recommended to upgrade the affected component. The vendor explains: "2960 1.5.1.7 has corrected many security issues. And 2960 is EoS with limited support, only major issues would be reviewed(e.g. unauthenticated vuln.)". This vulnerability only affects products that are no longer supported by the maintainer.

Source: CVE List V5 (CVE Program), cve_2026-10-29_0000Z, as of 29 Oct 2026. About the data.

Weakness

• CWE-77
• CWE-74

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record.

Timeline

References

• CVE-2026-113391 | CVE Analysis and Report (Third-party advisory)
• Submit #992244 | DrayTek Vigor2960 Vigor2960 1.5.1.6 (revision 8218) Upload Filename Command Injection Across Multiple Authenticated (Third-party advisory)
• VDB-422667 | DrayTek Vigor2960 Upload Endpoint mainfunction.cgi uploadlangs command injection (Vulnerability database, Technical description)
• github.com (Exploit)
• VDB-422667 | CTI Indicators (IOB, IOC, TTP, IOA)

Known exploited DrayTek vulnerabilities

• CVE-2024-12987: DrayTek Vigor Routers OS Command Injection Vulnerability (added 15 May 2025)
• CVE-2020-15415: DrayTek Multiple Vigor Routers OS Command Injection Vulnerability (added 30 Sep 2024)
• CVE-2021-20123: Draytek VigorConnect Path Traversal Vulnerability (added 3 Sep 2024)
• CVE-2021-20124: Draytek VigorConnect Path Traversal Vulnerability (added 3 Sep 2024)
• CVE-2020-8515: Multiple DrayTek Vigor Routers Web Management Page Vulnerability (added 3 Nov 2021)