What is CVE-2021-20129?

CVE-2021-20129 is a high-severity vulnerability in Draytek Vigorconnect, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.5/10. Published 2021-10-13.

How severe is CVE-2021-20129?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2021-20129 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Draytek Vigorconnect

CVE-2021-20129

An information disclosure vulnerability exists in Draytek VigorConnect 1.6.0-B3, allowing an unauthenticated attacker to export system logs.

Published 2021-10-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.017 (76.3th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Draytek Vigorconnect — versions 1.6.0
Draytek Vigorconnect — versions 1.6.0-B3

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

Public proof-of-concept exploits

References

www.tenable.com/security/research/tra-2021-42 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-20129?: CVE-2021-20129 is a high-severity vulnerability in Draytek Vigorconnect, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.5/10. Published 2021-10-13.
How severe is CVE-2021-20129?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-20129 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.