CVE-2017-20223: Telesquare SKT LTE Router SDT-CS3B1 firmware version 1.2.0 contains an insecure direct object reference vulner

This month

CRITICAL 9.8REMOTEMITIGATE

CVE-2017-20223 is a critical-severity flaw (CVSS 9.8) affecting sdt-cs3b1 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 55%)
CISA exploited list	No
Weakness	CWE-639
Published	2026-03-16
Last modified	2026-06-17

Publisher (CNA): VulnCheck · Vendor: telesquare

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-16 14:17 UTCPublished CVE record published
2026-06-17 01:15 UTCUpdated Record last modified

telesquare sdt-cs3b1 firmware MITIGATE

Affected: 1.2.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2017-20223?

sdt-cs3b1 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-20223 being exploited?

CVE-2017-20223 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2017-20223 affect?

CVE-2017-20223 affects sdt-cs3b1 firmware. Severity is critical (CVSS 9.8). 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. Attacke

How urgent is CVE-2017-20223?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-20224 CRITICAL 9.8 MITIGATE Telesquare SKT LTE Router SDT-CS3B1 version 1.2.0 contains an arbitrary file upload vulnerability that allows
CVE-2017-20222 HIGH 7.5 MITIGATE Telesquare SKT LTE Router SDT-CS3B1 software version 1.2.0 contains an unauthenticated remote reboot vulnerabi
CVE-2017-20221 MEDIUM 4.3 MITIGATE Telesquare SKT LTE Router SDT-CS3B1 version 1.2.0 contains a cross-site request forgery vulnerability that all

References

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