CVE-2021-20129Public exploitNetwork attack vector

Unauthenticated log disclosure via ExportServlet

Published Oct 13, 2021 · Updated Aug 3, 2024

Information disclosure in DrayTek VigorConnect 1.6.0-B3 allows remote attackers to download system and action logs without authentication. ExportServlet processes attacker-selected log types without enforcing authentication and returns the corresponding log export. Network access to the management service is sufficient, and disclosed logs can reveal target details useful for further attacks.

CVSS severity5.3
Medium
EPSS probability1.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in DrayTek VigorConnect 1.6.0-B3 allows remote attackers to download system and action logs without authentication. ExportServlet processes attacker-selected log types without enforcing authentication and returns the corresponding log export. Network access to the management service is sufficient, and disclosed logs can reveal target details useful for further attacks.

The record

CVE
CVE-2021-20129
Published
Oct 13, 2021
Updated
Aug 3, 2024
Vendor
DrayTek
Product
VigorConnect
Classifications
CWE-200, CWE-532, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.6.0-B3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

DrayTek · VigorConnectversion=1.6.0-B3

Published CVSS scores

5.3TenableCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-532Insertion of Sensitive Information into Log File
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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