CVE-2020-36963
Unknown Unknown - Not Provided
Authentication Bypass in Intelbras RF 301K Allows Config Download

Publication date: 2026-01-28

Last updated on: 2026-01-28

Assigner: VulnCheck

Description
Intelbras Router RF 301K firmware version 1.1.2 contains an authentication bypass vulnerability that allows unauthenticated attackers to download router configuration files. Attackers can send a specific HTTP GET request to /cgi-bin/DownloadCfg/RouterCfm.cfg to retrieve sensitive router configuration without authentication.
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Meta Information
Published
2026-01-28
Last Modified
2026-01-28
Generated
2026-06-16
AI Q&A
2026-01-29
EPSS Evaluated
2026-06-15
NVD
CVE-2020-36963
EUVD
EUVD-2020-30886
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
intelbras router_rf_301k 1.1.2
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.
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Executive Summary

This vulnerability is an authentication bypass in Intelbras Router RF 301K firmware version 1.1.2. It allows unauthenticated attackers to download the router's configuration files by sending a specific HTTP GET request to /cgi-bin/DownloadCfg/RouterCfm.cfg, thereby accessing sensitive router configuration without needing to authenticate.

Impact Analysis

The vulnerability can impact you by allowing attackers to obtain sensitive router configuration files without authentication. This could lead to exposure of network settings, credentials, or other sensitive information, potentially enabling further attacks or unauthorized access to your network.

Detection Guidance

You can detect this vulnerability by attempting to access the URL path /cgi-bin/DownloadCfg/RouterCfm.cfg on the Intelbras Router RF 301K device without authentication. For example, using a command like: curl http://<router-ip>/cgi-bin/DownloadCfg/RouterCfm.cfg If the router returns the configuration file without requiring authentication, it is vulnerable.

Mitigation Strategies

Immediate mitigation steps include restricting external access to the router's management interface, applying any available firmware updates from Intelbras that address this vulnerability, and monitoring network traffic for unauthorized access attempts to /cgi-bin/DownloadCfg/RouterCfm.cfg. If no patch is available, consider isolating the device from untrusted networks.

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