How severe is CVE-2021-20123?

CVE-2021-20123 has a CVSS 3.1 base score of 7.5 (HIGH). EPSS estimates a 90.2% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2021-20123: Draytek VigorConnect Path Traversal Vulnerability

CISA Known Exploited Vulnerabilities

Draytek VigorConnect Path Traversal Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2024-09-03

Remediation due

2024-09-24

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

CISA notes
https://www.draytek.com/about/security-advisory/vigorconnect-software-security-vulnerability-(cve-2021-20123-cve-2021-20129); https://nvd.nist.gov/vuln/detail/CVE-2021-20123

Description

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

Severity

CVSS 3.1 · CISA7.5 HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC · CISA-ADP

Exploitationactive

Automatableyes

Technical impactpartial

Affected Products

Vendor	Product	Affected versions
-	Draytek VigorConnect	1.6.0-B3

References

1 Links

Other references

https://www.tenable.com/security/research/tra-2021-42

Record Details

Published

2021-10-13

Last updated

2025-10-21

Assigner (CNA)

tenable

Credited to

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.