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CVE-2021-20124 is an unauthenticated path traversal/local file inclusion vulnerability in DrayTek VigorConnect 1.6.0-B3, specifically in the file download functionality exposed through the WebServlet endpoint. The vulnerable request path is /ACSServer/WebServlet using the act=getMapImg_acs2 action, where attacker-controlled filename input is not properly restricted to the intended directory. By supplying traversal sequences in the filename parameter, a remote attacker can cause the application to read and return arbitrary files from the underlying operating system. Reported proof-of-concept requests demonstrate retrieval of sensitive files such as /etc/passwd on Linux and windows/win.ini on Windows. The content states the application accesses these files with root privileges, increasing the sensitivity of accessible data.
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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 WebServlet allowing arbitrary file read with root privileges.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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