CVE-2021-20124 (GCVE-0-2021-20124)

Vulnerability from cvelistv5 – Published: 2021-10-13 15:48 – Updated: 2025-10-21 23:25
VLAI CISA Shadowserver KEVIntel
Summary
A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: active Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • Path Traversal
  • CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
Vendor Product Version
n/a Draytek VigorConnect Affected: 1.6.0-B3
draytek vigorconnect Affected: 1.6.0
    cpe:2.3:a:draytek:vigorconnect:1.6.0:beta3:*:*:*:*:*:*
 Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4dc64d78-4417-4bd2-b473-bd8413c80b7a

Vulnerability ID: CVE-2021-20124

Status: Confirmed

Status Updated: 2024-09-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2024-09-03
Asserted: 2024-09-03
Scope
Notes: KEV entry: Draytek VigorConnect Path Traversal Vulnerability | Affected: DrayTek / VigorConnect | Description: 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. | Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. | Due date: 2024-09-24 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://www.draytek.com/about/security-advisory/vigorconnect-software-security-vulnerability-(cve-2021-20123-cve-2021-20129); https://nvd.nist.gov/vuln/detail/CVE-2021-20124
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-22
Feed CISA Known Exploited Vulnerabilities Catalog
Product VigorConnect
Due Date 2024-09-24
Date Added 2024-09-03
Vendorproject DrayTek
Vulnerabilityname Draytek VigorConnect Path Traversal Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:26 UTC | Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 58400391-ca7d-4d81-a25d-1c80414be6b6

Vulnerability ID: CVE-2021-20124

Status: Confirmed

Status Updated: 2026-07-06 00:00 UTC

Exploited: Yes

Characteristics
Severity: 75.0
Timestamps
First Seen: 2024-09-03
Asserted: 2024-09-03
Last Seen: 2026-07-06
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Draytek / VigorConnect | Class: device-management-platform | Severity: High (CVSS 7.5) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-06: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class device-management-platform
7D Avg 0
Vendor Draytek
30D Avg 7
90D Avg 4
Product VigorConnect
Cisa Kev yes
Connections 1
Observation Date 2026-07-06
Vulnerability Class CVSS
Vulnerability Score 7.5
Vulnerability Severity High
References
Created: 2026-06-30 09:23 UTC | Updated: 2026-07-08 01:04 UTC
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: bffcda41-1354-4b01-81ab-d4d922cef798

Vulnerability ID: CVE-2021-20124

Status: Confirmed

Status Updated: 2024-09-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2024-09-03
Asserted: 2024-09-03
Scope
Notes: KEVIntel entry: A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the WebServlet endpoint. An... | Affected: Draytek / Draytek VigorConnect | CVSS: 7.5 (HIGH) | EPSS: 0.69248 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the WebServlet endpoint. An...
Vendor Draytek
Product Draytek VigorConnect
Added Date 2024-09-03T00:00:00.000Z
Cvss Score 7.5
Epss Score 0.69248
Cvss Severity HIGH
Epss Percentile 0.99271
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:05 UTC | Updated: 2026-06-23 14:05 UTC
Show details on NVD website
To clipboard 

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}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.