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

> Attackers can bypass authorization and access sensitive resources by manipulating input parameters in Telesquare SKT LTE Router firmware.

- **Severity:** Critical 9.3 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Mar 2026
- **Updated:** 7 Apr 2026
- **Also known as:** GHSA-hc2g-56j9-8384

## What is CVE-2017-20223?

CVE-2017-20223 is a critical missing authorization vulnerability in Telesquare SDT-CS3B1, published on 16 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2017-20223?

It affects 1 product.


Products: Telesquare Sdt-Cs3b1 Firmware.

## How do I fix CVE-2017-20223?

No fix has been published for CVE-2017-20223 yet. Limit exposure of the affected software until one is available.

## Is CVE-2017-20223 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20223 exists.

## Other vulnerabilities in Telesquare SDT-CS3B1

- [CVE-2021-46422](https://insights.sbomify.com/CVE-2021-46422/): Command injection in n/a (critical 9.8)
- [CVE-2018-12526](https://insights.sbomify.com/CVE-2018-12526/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2017-20224](https://insights.sbomify.com/CVE-2017-20224/): Telesquare SKT LTE Router SDT-CS3B1 WebDAV Arbitrary File Upload (critical 9.3)
- [CVE-2017-20222](https://insights.sbomify.com/CVE-2017-20222/): Telesquare SKT LTE Router SDT-CS3B1 Unauthenticated Remote Reboot (high 8.7)
- [CVE-2017-20221](https://insights.sbomify.com/CVE-2017-20221/): Telesquare SKT LTE Router SDT-CS3B1 CSRF System Command Execution (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-20223 and fix it if it is affected.

What it is: CVE-2017-20223 is a critical missing authorization vulnerability in Telesquare SDT-CS3B1, published on 16 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20223 exists.

Affected product: Telesquare SDT-CS3B1. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2017-20223/ (Markdown: https://insights.sbomify.com/CVE-2017-20223/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-20223
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-20223
- OSV: https://osv.dev/vulnerability/CVE-2017-20223

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From sbomify Insights: https://insights.sbomify.com/CVE-2017-20223/
Summaries are generated and may contain mistakes; the official description above is the record.