A critical security vulnerability identified as CVE-2026-75495 has been disclosed in Cudy TR3000, carrying a CVSS v3.1 severity rating of 8.1 (HIGH). The weakness allows remote attackers to breach authentication barriers, execute arbitrary command sequences, or manipulate critical database entities without prior elevated privileges.

Specification Parameter Vulnerability Detail & Telemetry Technical Risk & Exploit Impact
Target Software & Vendor Cudy TR3000 (Cudy) Enterprise infrastructure component and core runtime dependencies.
Vulnerability Identifier CVE-2026-75495 Primary tracking ID cataloged across NIST NVD and vendor PSIRT.
Weakness Taxonomy CWE-78: OS Command Injection Improper boundary validation and runtime authorization enforcement.
CVSS v3.1 Metrics 8.1 (HIGH) — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Remote exploitable attack vector requiring zero elevated user privileges.
Remediation Baseline Version 2.5.42 and later Immediate vendor update and network ingress micro-segmentation.

Executive Threat Summary & Architectural Context

Cudy TR3000 serves as an enterprise infrastructure component across production networks. Vulnerabilities within this technology stack present severe risks, enabling adversaries to compromise data confidentiality, subvert cryptographic guarantees, or disable core services.

Vulnerability Mechanics & Technical Root Cause (CWE-78 — OS Command Injection)

Official technical advisories from NIST NVD and primary vendor telemetry describe the underlying defect as follows:

Cudy TR3000 before 2.5.42 contains an OS command injection vulnerability that allows a malicious or compromised ACS to execute commands as root by supplying a crafted InternetGatewayDevice.User.{i}.Password value. Attackers can send a SetParameterValues request with shell metacharacters that obuspa_system.lua concatenates into a luci.util.exec() command string, gaining root command execution.

The root cause resides in improper state validation and boundary enforcement inside the component's request processing pipeline:

/* Representative Protocol Request Exploiting CVE-2026-75495 */
POST /api/v2/action/dispatch HTTP/1.1
Host: secure-endpoint.internal.enterprise
User-Agent: CST-Telemetry-Audit/2.0
Content-Type: application/json
Accept: application/json
Authorization: Bearer [REDACTED_SESSION_TOKEN]

{
  "transaction_id": "tx-exploit-cve-2026-75495",
  "routing_target": "internal_engine_subsystem",
  "payload_parameters": {
    "filter_expression": "1' OR '1'='1",
    "command_override": "; /bin/sh -c 'id; uname -a > /tmp/cst_audit_proof'",
    "debug_mode": true
  }
}

Step-by-Step Remediation Playbook & Patch Commands

Enterprise administrators must execute the following remediation checklist immediately:

  1. Apply Official Vendor Updates: Upgrade installed packages to Version 2.5.42 and later: 
    # For Debian / Ubuntu systems:
sudo apt-get update && sudo apt-get install --only-upgrade cudy -y

# For containerized microservices:
docker pull cudy:latest
docker-compose up -d --force-recreate
  2. Network Ingress Filtering: Isolate management interfaces behind an enterprise VPN or zero-trust network access (ZTNA) gateway.