What is CVE-2021-20123?

CVE-2021-20123 is a high-severity vulnerability in Draytek Vigorconnect, classified under Path Traversal. CVSS score: 7.5/10. Published 2021-10-13.

How severe is CVE-2021-20123?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-20123 known to be exploited?

Yes. CVE-2021-20123 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-09-03), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Path Traversal in Draytek Vigorconnect

CVE-2021-20123

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.743 (99.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Draytek Vigorconnect — versions 1.6.0
N/a Draytek Vigorconnect — versions 1.6.0-B3

Weakness classification (CWE)

CWE-22 — Path Traversal

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2024-09-03. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2024-09-24.

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

Public proof-of-concept exploits

References

vulnreport@tenable.com (Exploit, Third Party Advisory, x_refsource_MISC)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2021-20123?: CVE-2021-20123 is a high-severity vulnerability in Draytek Vigorconnect, classified under Path Traversal. CVSS score: 7.5/10. Published 2021-10-13.
How severe is CVE-2021-20123?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-20123 known to be exploited?: Yes. CVE-2021-20123 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2024-09-03), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.