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Vulnerabilities

Vulnerability · CVE-2021-20124

Draytek VigorConnect Path Traversal Vulnerability

Published Oct 13, 2021 · catalog updated Jun 16, 2026 · DrayTek VigorConnect

Patch now

CVE-2021-20124 is in the CISA known-exploited catalog, due Sep 24, 2024. Confirm DrayTek VigorConnect against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High7.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
96.31%
Remediation
Remediation guidance
Affected products
cpe draytek/vigorconnect · vendor DrayTek VigorConnect

Draytek VigorConnect contains a path traversal vulnerability 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. VulnCheck canary evidence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe draytek/vigorconnect1.6.0
  • vendor DrayTek VigorConnectversion unspecified

How to fix CVE-2021-20124

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2021-20124 is in the CISA known-exploited catalog, due Sep 24, 2024. Confirm DrayTek VigorConnect against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 1.6.0. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-22: Path Traversal. EPSS 96.31%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 13, 2021 · Catalog

    Detected

    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.

  2. Sep 3, 2024 · CISA KEV

    Known exploited

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

  3. Sep 24, 2024 · CISA KEV

    Remediation due

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

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Sources

  • CISA KEVConfirmed exploitationCVE-2021-20124

    Draytek VigorConnect contains a path traversal vulnerability 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.gov
  • CVE.orgVulnerability recordCVE-2021-20124

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-20124

    30-day exploitation probability 96.3%

    first.org
  • NIST NVDVulnerability recordCVE-2021-20124

    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 pri

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2021-20124

    Draytek VigorConnect contains a path traversal vulnerability 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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.