High severity · published Jan 28, 2026
CVE-2020-36963
Intelbras Router RF 301K 1.1.2 - Authentication Bypass
7.5
CVSS
0.4%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 35% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IR
Intelbras Router RF 301K · Intelbras
firmware version 1.1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-36963
CVE.org
https://www.cve.org/CVERecord?id=CVE-2020-36963
www.exploit-db.com
https://www.exploit-db.com/exploits/49126
www.intelbras.com
https://www.intelbras.com/pt-br/
www.vulncheck.com
https://www.vulncheck.com/advisories/intelbras-router-rf-k-authentication-bypass