Which products and versions are affected by CVE-2021-20124?

Affected: Vigorconnect (Draytek) versions 1.6.0-beta3, >= 1.6.0-B3. The full list is in the CVE brief.

Is CVE-2021-20124 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 3, 2024.

Is CVE-2021-20124 in the CISA KEV catalog?

Yes. It was added on Sep 3, 2024 with a federal remediation due date of Sep 24, 2024.

Is there a public exploit for CVE-2021-20124?

Public exploit code is available.

Is there a fix for CVE-2021-20124?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2021-20124 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2021-20124

HighExploitedPublic exploit

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the WebServlet endpoint.

Published Oct 13, 2021 · Updated Nov 3, 2025

Key Facts

Patch immediately

CVE-2021-20124 is a high-severity vulnerability (CVSS 7.5 v3.1) affecting Vigorconnect (Draytek).
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 3, 2024. Public exploit code is available.
EPSS estimates a 96% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

7.5

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

EPSS (30-day exploit likelihood)

96%

Higher than 99.8% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2021-20124 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Sep 3, 2024	Sep 24, 2024	Not reported
Industry KEV feed	Sep 3, 2024	Sep 24, 2024	Not reported
CIRCL KEV	Sep 3, 2024	Sep 24, 2024	Not reported
ENISA EUVD	Sep 3, 2024	n/a	Not reported

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

Affected Products

2 affected entries in total

Product	Affected versions	Fixed in
VigorconnectDraytek	1.6.0-beta3, >= 1.6.0-B3	n/a

Timeline

Publicly disclosed
Oct 13, 2021
Added to CISA KEV
Sep 3, 2024
Added to Industry KEV feed
Sep 3, 2024
Added to CIRCL KEV
Sep 3, 2024
Added to ENISA EUVD
Sep 3, 2024
Last updated
Nov 3, 2025

Weakness Type

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

References

7 more references in the full CVE brief

FAQ

Common Questions.

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the WebServlet endpoint.
Affected: Vigorconnect (Draytek) versions 1.6.0-beta3, >= 1.6.0-B3. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Sep 3, 2024.
Yes. It was added on Sep 3, 2024 with a federal remediation due date of Sep 24, 2024.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2021-20124 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.