What is CVE-2020-36963?

CVE-2020-36963 is a high-severity vulnerability in Intelbras Router Rf 301k, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-01-28.

How severe is CVE-2020-36963?

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

Auth bypass in Intelbras Router Rf 301k

CVE-2020-36963

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.

Vulnerability class: Broken Authentication

EPSS: 0.004 (29.0th percentile) — read the EPSS interpretation.

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.

Affected products

Intelbras Router Rf 301k — versions firmware version 1.1.2

Weakness classification (CWE)

CWE-306 — Missing Authentication for Critical Function

References

ExploitDB-49126 (exploit)
Intelbras Official Homepage (product)
VulnCheck Advisory: Intelbras Router RF 301K 1.1.2 - Authentication Bypass (third-party-advisory)

Frequently asked questions

What is CVE-2020-36963?: CVE-2020-36963 is a high-severity vulnerability in Intelbras Router Rf 301k, classified under Missing Authentication for Critical Function. CVSS score: 7.5/10. Published 2026-01-28.
How severe is CVE-2020-36963?: High severity. CVSS v3 base score is 7.5 out of 10.