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Vulnerability record · CVE-2021-20127 · published 13 October 2021

CVE-2021-20127: Draytek vigorconnect vulnerability

Draytek · Vigorconnect

An arbitrary file deletion vulnerability exists in the file delete functionality of the Html5Servlet endpoint of Draytek VigorConnect 1.6.0-B3. This allows an authenticated user to arbitrarily delete files in any location on the target operating system with root privileges.

8.1 CVSS 3.1 High EPSS 1.1% · top 34.9%
8.1CVSS 3.1 base score, v2 8.5
1.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

An arbitrary file deletion vulnerability exists in the file delete functionality of the Html5Servlet endpoint of Draytek VigorConnect 1.6.0-B3. This allows an authenticated user to arbitrarily delete files in any location on the target operating system with root privileges.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Affected products

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

References

LinkTags
https://www.tenable.com/security/research/tra-2021-42 ExploitThird Party Advisory
https://www.tenable.com/security/research/tra-2021-42 ExploitThird Party Advisory

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Related vulnerabilities

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

7.5CVE-2021-20123Draytek VigorConnect path traversal in DownloadFileServletDraytek VigorConnect 1.6.0-B3 contains a path traversal (local file inclusion) flaw in the file download functionality of the DownloadFileServlet end…KEVEPSS 90%analysed7.5CVE-2021-20124Draytek VigorConnect path traversal allows unauthenticated file downloadDraytek VigorConnect 1.6.0-B3 contains a path traversal (local file inclusion) flaw in the file download functionality of the WebServlet endpoint. An…KEVEPSS 96%analysed9.8CVE-2021-20125Draytek vigorconnect path traversal vulnerabilityAn arbitrary file upload and directory traversal vulnerability exists in the file upload functionality of DownloadFileServlet in Draytek VigorConnect…EPSS 3.9%8.8CVE-2021-20126Draytek vigorconnect cross-site request forgery vulnerabilityDraytek VigorConnect 1.6.0-B3 lacks cross-site request forgery protections and does not sufficiently verify whether a well-formed, valid, consistent …EPSS 0.63%7.5CVE-2021-20129Draytek vigorconnect sensitive information in log file vulnerabilityAn information disclosure vulnerability exists in Draytek VigorConnect 1.6.0-B3, allowing an unauthenticated attacker to export system logs.EPSS 1.7%5.4CVE-2021-20128Draytek vigorconnect cross-site scripting vulnerabilityThe Profile Name field in the floor plan (Network Menu) page in Draytek VigorConnect 1.6.0-B3 was found to be vulnerable to stored XSS, as user input…EPSS 0.57%

Source: NIST National Vulnerability Database (record CVE-2021-20127), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.