Is CVE-2021-20123 actively exploited?

Yes. CVE-2021-20123 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, which means exploitation in the wild has been confirmed.

Can CVE-2021-20123 be exploited remotely?

The attack vector of CVE-2021-20123 has not been classified yet.

What is the CVSS score of CVE-2021-20123?

CVE-2021-20123 has not received a CVSS score yet.

HOME VULNERABILITIESCVE-2021-20123

HIGHCISA KEVIN THE WILD

CVE-2021-20123

Published: September 3, 2024

EPSS:93.99%probability of exploitation in 30 daysPercentile:99.9th

Official Description

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.

NVD Source

CISA KEV Advisory

Draytek VigorConnect Path Traversal Vulnerability

Added to KEV: 2024-09-03Federal patch deadline: 2024-09-24

Required Action (CISA)

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

Risk Analysis

This vulnerability in Draytek VigorConnect's DownloadFileServlet endpoint allows an unauthenticated attacker to download arbitrary files from the underlying operating system with root privileges due to a path traversal flaw. The high EPSS score of 0.93989 indicates a very high likelihood of exploitation, making this a critical vulnerability. Its inclusion in CISA's KEV catalog confirms active exploitation.

This vulnerability is actively being exploited in the wild, as confirmed by its exploit status and inclusion in CISA's KEV catalog. The flaw is remotely exploitable by unauthenticated attackers.

Recommended Action

Upgrade Draytek VigorConnect to a patched version to remediate the path traversal vulnerability. Restrict network access to the VigorConnect interface to authorized personnel only.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2021-20123 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CISA has added CVE-2021-20123 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.