CVE intelligence and bounded remediation

CVE-2021-34795 — Cisco Catalyst Pon Switch Cgp-Ont-1P Firmware security vulnerability

Critical CVSS 10

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.

Severity
Critical
CVSS
10 (3.1)
Published
2021-11-04
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-284, CWE-1188

Affected products

  • cisco / catalyst_pon_switch_cgp-ont-1p_firmware
  • cisco / catalyst_pon_switch_cgp-ont-4p_firmware
  • cisco / catalyst_pon_switch_cgp-ont-4pvc_firmware
  • cisco / catalyst_pon_switch_cgp-ont-4tvcw_firmware
  • cisco / catalyst_pon_switch_cgp-ont-4pv_firmware

Matched remediation archetype

Authorization bypass, IDOR, and cross-tenant access

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Map object and action authorization checks across API, UI, batch, import/export, and background-job paths.
  • Identify tenant, ownership, role, and policy boundaries for affected resources and administrative operations.
  • Use synthetic fixtures to compare intended access matrices without accessing another user's real data.

Remediate safely

  • Enforce server-side authorization at each resource access and state transition using the authenticated principal and trusted tenant context.
  • Scope data queries by tenant and ownership; treat client-supplied identifiers, roles, and policy claims as untrusted.
  • Add deny-by-default policy tests for horizontal and vertical access across every affected transport.

Authoritative sources

Complete CVE record and remediation plan

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