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CVE-2021-20124

7.5, high Known exploited

Draytek VigorConnect Path Traversal Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
7.5, high high CVSS v3.1
EPSS, next 30 days
96% higher than 99.8% of scored CVEs
Exploitation
Confirmed in the wild
Published
13 Oct 20215 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 3 Sept 2024. US federal agencies had to remediate by 24 Sept 2024, a deadline that has passed.

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

Description

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

Details

Vendor
DrayTek
Product
Draytek VigorConnect
Weakness
CWE-22 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
vulnreport@tenable.com

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

References 2

Exploit code 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other DrayTek CVEs

Every DrayTek CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2024-12987 DrayTek Vigor Routers OS Command Injection Vulnerability KEV EPSS 98% 9.8, critical
  • CVE-2021-20123 Draytek VigorConnect Path Traversal Vulnerability KEV EPSS 90% 7.5, high
  • CVE-2020-15415 DrayTek Multiple Vigor Routers OS Command Injection Vulnerability KEV EPSS 84% 9.8, critical
  • CVE-2020-8515 Multiple DrayTek Vigor Routers Web Management Page Vulnerability KEV EPSS 100% 9.8, critical

Beyond this page

Is CVE-2021-20124 in your network?

This page tells you how dangerous CVE-2021-20124 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2021-20124 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2021-20124 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.