CRITICAL

CVE-2021-20125

CVSS v3

9.8

CRITICAL

EPSS Score

3.9 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2021-20125 yet.

Full record on NVD

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.

Technical details

Published: 2021-10-13

Frequently asked questions

What is CVE-2021-20125?

Is CVE-2021-20125 actively exploited?

Active exploitation of CVE-2021-20125 has not been confirmed. Its EPSS score was 3.9% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

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

CVE-2021-20125 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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