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CVE-2021-20123

Draytek VigorConnect Path Traversal Vulnerability

7.5 HIGHActively exploited (CISA KEV)Public exploitEPSS 90.2%
  1. Published13 Oct 2021
  2. Added to CISA KEV3 Sept 2024
  3. Remediation due24 Sept 2024
Actively exploited (CISA KEV)

Draytek VigorConnect contains a path traversal vulnerability in the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

Added to KEV: 3 Sept 2024Federal remediation due: 24 Sept 2024

Description

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 from the underlying operating system with root privileges.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Draytek Vigorconnect1.6.0

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2021-20123 being actively exploited?

Yes. CVE-2021-20123 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Sept 2024.

How severe is CVE-2021-20123?

CVE-2021-20123 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 90.2% probability of exploitation.

Which products are affected by CVE-2021-20123?

Affected products include Draytek Vigorconnect.

How do I fix CVE-2021-20123?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2021-20123 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.