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CVE-2021-20123 is an unauthenticated path traversal/local file inclusion vulnerability in DrayTek VigorConnect 1.6.0-B3 affecting the file download functionality of the DownloadFileServlet endpoint. The vulnerable endpoint fails to properly restrict or sanitize user-controlled file path input, allowing traversal outside the intended directory. By supplying a crafted GET request to /ACSServer/DownloadFileServlet with a manipulated show_file_name parameter, a remote attacker can cause the application to return arbitrary files from the underlying operating system. Reported examples include retrieval of /etc/passwd on Linux and windows/win.ini on Windows. The content states that file access occurs with root privileges, increasing the sensitivity of accessible files.
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No public exploit code observed for this vulnerability.
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3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in DrayTek VigorConnect that can be exploited to download arbitrary files from the underlying operating system with root privileges.
Unauthenticated local file inclusion (path traversal) in Draytek VigorConnect DownloadFileServlet allowing arbitrary file read (e.g., /etc/passwd, win.ini) with root privileges.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.