Authentication bypass using an alternate path or channel in Cisco Systems, Inc products - CVE-2021-40112

Vulnerability identifier: #VU57960

CSH Severity: High

CVSS v4: 8.8 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-40112

CWE-ID: CWE-288

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to modify the configuration of the device.

The vulnerability exists due to improper HTTPS input validation. A remote attacker can send a specially crafted HTTPS request to the web management interface and modify the configuration.

Catalyst PON Switch CGP-ONT-1P
Catalyst PON Switch CGP-ONT-4P
Catalyst PON Switch CGP-ONT-4PV
Catalyst PON Switch CGP-ONT-4PVC
Catalyst PON Switch CGP-ONT-4TVCW

Install updates from vendor's website.

Catalyst PON Switch CGP-ONT-1P - update to 1.1.1.14
Catalyst PON Switch CGP-ONT-4P - update to 1.1.3.17
Catalyst PON Switch CGP-ONT-4PV - update to 1.1.3.17
Catalyst PON Switch CGP-ONT-4PVC - update to 1.1.3.17
Catalyst PON Switch CGP-ONT-4TVCW - update to 1.1.3.17

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-catpon-multivulns-CE3DSYGr

• Multiple vulnerabilities in Cisco Catalyst PON Series Switches