CVE-2021-34795

Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

Attend

*SSVC

Descriptions

Multiple vulnerabilities in the web-based management interface of the Cisco Catalyst Passive Optical Network (PON) Series Switches Optical Network Terminal (ONT) could allow an unauthenticated, remote attacker to perform the following actions: Log in with a default credential if the Telnet protocol is enabled Perform command injection Modify the configuration For more information about these vulnerabilities, see the Details section of this advisory.

Múltiples vulnerabilidades en la interfaz de administración basada en web de los Switches de la serie Cisco Catalyst Passive Optical Network (PON) Optical Network Terminal (ONT) podrían permitir a un atacante remoto no autenticado llevar a cabo las siguientes acciones: Iniciar sesión con una credencial predeterminada si el protocolo Telnet está habilitado Llevar a cabo una inyección de comandos Modificar la configuración Para más información sobre estas vulnerabilidades, consulte la sección Detalles de este aviso

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:Attend

Exploitation

None

Automatable

Yes

Tech. Impact

Total

* Organization's Worst-case Scenario

Timeline

2021-06-15 CVE Reserved
2021-11-04 CVE Published
2024-11-07 CVE Updated
2025-04-13 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-284: Improper Access Control
CWE-1188: Initialization of a Resource with an Insecure Default

CAPEC

References (1)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-catpon-multivulns-CE3DSYGr	2023-11-07

URL	Date	SRC

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-1p Firmware Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-1p Firmware"	< 1.1.1.14 Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-1p Firmware" and version " < 1.1.1.14"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-1p Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-1p"	*	-	Safe
Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4p Firmware Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4p Firmware"	< 1.1.3.17 Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4p Firmware" and version " < 1.1.3.17"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4p Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4p"	*	-	Safe
Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4pvc Firmware Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4pvc Firmware"	< 1.1.3.17 Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4pvc Firmware" and version " < 1.1.3.17"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4pvc Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4pvc"	*	-	Safe
Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4tvcw Firmware Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4tvcw Firmware"	< 1.1.3.17 Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4tvcw Firmware" and version " < 1.1.3.17"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4tvcw Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4tvcw"	*	-	Safe
Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4pv Firmware Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4pv Firmware"	< 1.1.3.17 Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4pv Firmware" and version " < 1.1.3.17"	-	Affected	in	Cisco Search vendor "Cisco"	Catalyst Pon Switch Cgp-ont-4pv Search vendor "Cisco" for product "Catalyst Pon Switch Cgp-ont-4pv"	*	-	Safe