CVE-2021-20124

Name: CVE-2021-20124
Creator: NVD / NIST
Published: 2021-10-13T16:15:07.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 69.25%

Last modified Jun 17, 2026

CVE-2021-20124 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 69.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

69.25%

99.3th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Sep 24, 2024.

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Draytek	Vigorconnect	1.6.0	Beta3

References

https://www.tenable.com/security/research/tra-2021-42Exploit, Third Party Advisory
https://www.tenable.com/security/research/tra-2021-42Exploit, Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20124US Government Resource

Timeline

Published: Oct 13, 2021
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2021-20124?

How severe is CVE-2021-20124?

CVE-2021-20124 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 69.25% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2021-20124?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-20124?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST