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Vulnerability record · CVE-2020-36963 · published 28 January 2026

CVE-2020-36963: Missing authentication for critical function vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.41% · top 66.9% CWE-306 · Missing authentication for critical function Deferred
8.7CVSS 4.0 base score
0.41%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://www.exploit-db.com/exploits/49126
https://www.intelbras.com/pt-br/
https://www.vulncheck.com/advisories/intelbras-router-rf-k-authentication-bypass
https://www.exploit-db.com/exploits/49126

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Source: NIST National Vulnerability Database (record CVE-2020-36963), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.