THREATPORT/VULNERABILITY/CVE-2021-20125
CRITICAL SEVERITY

CVE-2021-20125

Vigorconnect vulnerability

CVSS
9.8
EPSS
3.8%
EPSS pct
89th
Exploited
No known
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.
Affected vendor
Draytek
Affected product
Vigorconnect
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)
  • CWE-22 — Path Traversal
  • CWE-434 — Unrestricted Upload of File with Dangerous Type
Published
2021-10-13

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to confidentiality, high impact to integrity, high impact to availability.

Its EPSS score of 3.8% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 89% of all scored CVEs.

Check your external exposure to CVE-2021-20125

  • Confirm whether Draytek Vigorconnect is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2021-20125.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2021-20125

ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2021-20125 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.

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