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CVE-2021-20123: Draytek VigorConnect Path Traversal Vulnerability

criticalknown exploitedpublic exploitCVE-2021-20123
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: Draytekproduct: VigorConnectPath traversal
What
VigorConnect has a path traversal vulnerability in the DownloadFileServlet endpoint allowing file downloads.
Who is affected
Unauthenticated attackers on systems running VigorConnect.
Urgency
Remediation is critical due to active exploitation.
Action
Update VigorConnect to the latest version to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2024-09-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-20123

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2021-20123coverage & exploitation statusNVD · CVE.org

Recent advisories for Draytek VigorConnect Path

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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