CVE-2021-20123: Draytek VigorConnect Path Traversal Vulnerability

CVE-2021-20123 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2024-09-03

DrayTek VigorConnect contains a path traversal vulnerability in the DownloadFileServlet endpoint. An unauthenticated remote attacker can exploit this to download arbitrary files from the underlying operating system with root privileges.

Vendors: DrayTek.

Quick answers

Is CVE-2021-20123 exploited in the wild?
Yes. CVE-2021-20123 is known to be exploited in the wild, first recorded on 3 September 2024. Treat it as urgent.
How severe is CVE-2021-20123?
Critical severity, with a CVSS score of 7.5, published 3 September 2024.
Which products and versions are affected?
DrayTek VigorConnect 1.6.0-B3.
Is there a fix for CVE-2021-20123?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2021-20123 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2021-20123?
Check whether you run DrayTek VigorConnect. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Affected products

  • DrayTek VigorConnect 1.6.0-B3

Timeline

  • 2021-10-13: disclosed: NVD Published Date
  • 2024-09-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog
  • 2024-09-03: exploited: Reported as exploited in the wild by CISA

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