Draytek VigorConnect Path Traversal Vulnerability
n/a — Draytek VigorConnect
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.
7.5
74.3%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- Oct 13, 2021
- Modified
- Oct 21, 2025
- Added to KEV
- Sep 3, 2024
- Federal patch due
- Sep 24, 2024
CISA required action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2021-20123, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2021-20123 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is 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 from the underlying operating system with root privileges.
How severe is CVE-2021-20123?
CVE-2021-20123 has a CVSS base score of 7.5 out of 10 (CVSS 3.1).
Is CVE-2021-20123 actively exploited in the wild?
Yes. CVE-2021-20123 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Sep 3, 2024, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2021-20123?
74.3% - meaning FIRST.org's EPSS model estimates a 74.3% probability this vulnerability will be exploited in the wild within 30 days (99% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2021-20123?
Yes - a public Nuclei template referencing CVE-2021-20123 exist in public repositories we checked.
What type of vulnerability is CVE-2021-20123?
CVE-2021-20123 is classified under CWE-22 (CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')).
Cross-checked against
Impactr finds and proves whether CVE-2021-20123 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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