CVE-2017-20223 — Telesquare SKT LTE Router SDT-CS3B1 firmware version 1

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

01What is this vulnerability?

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.

02Affected products

Vendor	Product	Versions
Telesquare	SDT	CS3B1 — 1.2.0

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2026-03-16T01:28:26.649Z
• Last modified: 2026-03-16T14:20:16.604Z

09References

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