CISA-confirmed known exploited vulnerability

CVE-2021-20123

Draytek VigorConnect Path Traversal Vulnerability

DrayTek · VigorConnect

Vulnerability details

Draytek VigorConnect contains a path traversal vulnerability in the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

Added to CISA KEV: 2024-09-03

Ransomware campaign use: Unknown

CISA due date: 2024-09-24

Defensive guidance from CISA

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

This is the source's required-action field, not an independently validated patch procedure. Refer to the vendor for exact affected versions and fixes.

Source catalog date: 2026-11-06T19:44:45.1797Z · Last retrieved: 2026-11-06 21:02:26 UTC

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