CVE-2021-20124: Draytek VigorConnect Path Traversal Vulnerability
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 file download functionality of the WebServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.
CSIRTS triage
- What
- VigorConnect has a path traversal vulnerability that allows unauthenticated attackers to download arbitrary files.
- Who is affected
- Unauthenticated attackers targeting Draytek VigorConnect deployments.
- Urgency
- Immediate action is required due to active exploitation and critical severity.
- Action
- Apply the latest patches for VigorConnect to resolve the vulnerability.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch VigorConnect
Get an email when a new VigorConnect advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2021-20124
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.
- Exploitation confirmedCVE-2021-20124Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 99% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2021-20124 | coverage & exploitation status | NVD · 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.
- criticalexploitedCVE-2021-20123: Draytek VigorConnect Path Traversal Vulnerabilitycisa-kev · 2024-09-03
More from CISA Known Exploited Vulnerabilities
- criticalCVE-2026-48939: iCagenda Unrestricted Upload of File with Dangerous Type Vulnerability2026-07-10
- criticalCVE-2026-56291: Balbooa Forms Unrestricted Upload of File with Dangerous Type Vulnerability2026-07-10
- criticalCVE-2026-48908: JoomShaper SP Page Builder Unrestricted Upload of File with Dangerous Type Vulnerability2026-07-07
- criticalCVE-2026-55255: Langflow Authorization Bypass Through User-Controlled Key Vulnerability2026-07-07
- criticalCVE-2026-48282: Adobe ColdFusion Path Traversal Vulnerability2026-07-07