CVE-2021-20123

HIGH7.5

CISA KEV

Published 2021-10-13 · Updated 2026-06-17 · Source vulnreport@tenable.com

Summary

CVE-2021-20123 is a high-severity (CVSS 7.5) vulnerability in DrayTek VigorConnect. CISA added it to the Known Exploited Vulnerabilities catalog on September 3, 2024, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by September 24, 2024. CISA does not currently list it as used in ransomware campaigns. DrayTek has 5 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 5 known-exploited DrayTek vulnerabilities →

Description

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

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

CWE-22CWE-22

CISA Known-Exploited Vulnerability

Product: DrayTek — VigorConnect

Name: Draytek VigorConnect Path Traversal Vulnerability

Date added: 2024-09-03 · Due: 2024-09-24

Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

References

View on NVD

More exploited DrayTek vulnerabilities

Most recently added to CISA KEV

CVE-2024-12987
Vigor Routers — DrayTek Vigor Routers OS Command Injection Vulnerability
added 2025-05-15
CVE-2020-15415
Multiple Vigor Routers — DrayTek Multiple Vigor Routers OS Command Injection Vulnerability
added 2024-09-30
CVE-2021-20124
VigorConnect — Draytek VigorConnect Path Traversal Vulnerability
added 2024-09-03
CVE-2020-8515
Multiple Vigor Routers — Multiple DrayTek Vigor Routers Web Management Page Vulnerability
added 2021-11-03

View all →

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