Security readout for executives and security teams
Plain-English summary
CVE-2017-20223 affects Telesquare SKT LTE Router SDT-CS3B1 firmware 1.2.0. It allows unauthenticated network attackers to bypass authorization by changing input parameters, potentially exposing sensitive information and router functions. Public exploit references exist, but the provided sources do not show confirmed active exploitation.
Executive priority
Treat as urgent if these routers are deployed or internet-accessible. The vulnerability is critical, remotely reachable, unauthenticated, and has public exploit references. If the product is not present, business risk is low.
Technical view
The issue is an insecure direct object reference, CWE-639, in SDT-CS3B1 firmware 1.2.0. The CVSS 3.1 score is 9.8, with network attack vector, low complexity, no privileges, and no user interaction. Impact is rated high for confidentiality, integrity, and availability.
Likely exposure
Exposure is limited to organizations using Telesquare SDT-CS3B1 routers running firmware 1.2.0, especially if management interfaces are reachable from untrusted networks. The sources do not identify other affected models or versions.
Exploitation context
Exploit listings are cited by Exploit-DB and Packet Storm, indicating public exploit information exists. CISA KEV status is not indicated, and the provided sources do not confirm exploitation in the wild.
Researcher notes
Sources describe an IDOR authorization bypass in firmware 1.2.0 but do not provide vendor remediation details in the bundle. Avoid assuming patch availability. Focus validation on asset presence, firmware version, management exposure, and access-control logs.
Mitigation direction
- Identify any Telesquare SDT-CS3B1 devices and confirm firmware version.
- Restrict router management access to trusted administrative networks only.
- Remove direct internet exposure for affected management interfaces.
- Check Telesquare or device-provider guidance for firmware updates or replacement advice.
- Monitor affected devices for unauthorized configuration changes or access attempts.
Validation and detection
- Inventory edge and cellular routers for SDT-CS3B1 model identifiers.
- Confirm whether firmware version 1.2.0 is installed.
- Review firewall rules for exposed router administration services.
- Check logs for suspicious access to administrative resources.
- Document compensating controls if no vendor fix is available.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-639: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2017-20223 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- Zero Science Lab DisclosureCVE reference · third-party-advisory
- Exploit DBCVE reference · exploit
- Packet Storm SecurityCVE reference · exploit
- CXSecurityCVE reference · third-party-advisory
- IBM X-Force ExchangeCVE reference · vdb-entry
- VulnCheck Advisory: Telesquare SKT LTE Router SDT-CS3B1 Insecure Direct Object ReferenceCVE reference · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Authorization Bypass Through User-Controlled Key
Authorization Bypass Through User-Controlled Key represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.