CVE-2017-20223Public exploitNetwork attack vector

Unauthenticated configuration disclosure via exposed management endpoints

Published Mar 16, 2026 · Updated Mar 16, 2026

Authorization bypass in Telesquare SDT-CS3B1 firmware 1.2.0 allows remote attackers to read router configuration via unauthenticated web requests. The management web server returns protected pages and CGI responses without enforcing access control, exposing network, wireless, account, device, and system data. Network access to the management interface is sufficient; the published artifact demonstrates information disclosure and access to administrative functionality, but not command execution.

CVSS severity9.3
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Telesquare SDT-CS3B1 firmware 1.2.0 allows remote attackers to read router configuration via unauthenticated web requests. The management web server returns protected pages and CGI responses without enforcing access control, exposing network, wireless, account, device, and system data. Network access to the management interface is sufficient; the published artifact demonstrates information disclosure and access to administrative functionality, but not command execution.

The record

CVE
CVE-2017-20223
Published
Mar 16, 2026
Updated
Mar 16, 2026
Vendor
Telesquare
Product
SDT-CS3B1
Classifications
CWE-639, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Telesquare · SDT-CS3B1version=1.2.0

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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