CVE-2021-40112

Cisco Catalyst PON Series Switches Optical Network Terminal Vulnerabilities

HIGH
7.5
CVSS Score
Published: November 4, 2021 at 03:35 PM UTC
Updated: June 17, 2026 at 04:06 AM UTC
11 products affected across 1 vendorCatalyst Pon Switch Cgp Ont 4TVCW FirmwareCatalyst Pon Switch Cgp Ont 4P FirmwareCatalyst Pon Switch Cgp Ont 1P Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

v < 1.1.1.14
Affected range stops below 1.1.1.14, so it looks safe — our inference, not a vendor statement
cisco-catalyst-pon-switch-cgp-ont-1p (same device)
v < 1.1.3.17
Affected range stops below 1.1.3.17, so it looks safe — our inference, not a vendor statement
cisco-catalyst-pon-switch-cgp-ont-4p (same device)
v < 1.1.3.17
Affected range stops below 1.1.3.17, so it looks safe — our inference, not a vendor statement
cisco-catalyst-pon-switch-cgp-ont-4pv (same device)
v < 1.1.3.17
Affected range stops below 1.1.3.17, so it looks safe — our inference, not a vendor statement
cisco-catalyst-pon-switch-cgp-ont-4pvc (same device)
v < 1.1.3.17
Affected range stops below 1.1.3.17, so it looks safe — our inference, not a vendor statement
cisco-catalyst-pon-switch-cgp-ont-4tvcw (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284NVD-CWE-Other

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