Is CVE-2021-20125 actively exploited?

No active exploitation of CVE-2021-20125 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-20125 be exploited remotely?

Yes. CVE-2021-20125 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-20125?

CVE-2021-20125 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2021-20125

CWE-22Published: October 13, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

An arbitrary file upload and directory traversal vulnerability exists in the file upload functionality of DownloadFileServlet in Draytek VigorConnect 1.6.0-B3. An unauthenticated attacker could leverage this vulnerability to upload files to any location on the target operating system with root privileges.

NVD Source

Technical Analysis

CVE-2021-20125 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.