EUVD-2017-18941Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V5 - File Handling File type validation, storage isolation
MITRE ATT&CK
2 techniques across 2 tactics: Command and Control, Persistence The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | This vulnerability presents extremely high real-world risk based on multiple factors: CVSS 9.8 indicates network-exploitable (AV:N) with no authentication required (PR:N), low attack complexity (AC:L), and no user interaction needed (UI:N), resulting in full compromise of confidentiality, integrity, and availability (C:H/I:H/A:H). The existence of multiple public proof-of-concept exploits from ZeroScience and CXSecurity significantly increases exploitation likelihood. While not currently in CISA KEV, the combination of unauthenticated remote code execution capability, public exploits, and the nature of LTE routers as internet-facing devices makes this a critical priority for any organization using affected devices. |
| Exploit ScenarioDerived | An attacker scans for exposed Telesquare SDT-CS3B1 routers on the internet and identifies the management interface. Using readily available proof-of-concept code, they send a PUT request to upload a malicious web shell or executable file to the web root directory. Since no authentication is required and the router accepts arbitrary file uploads through WebDAV, the attack succeeds immediately. The attacker then accesses their uploaded shell through a standard HTTP request, gaining full control over the router to intercept traffic, pivot to internal networks, or brick the device. |
Get an e-mail when this CVE is exploited, patched or re-scored. Free account.
Alert meAnalysisAIv1 – Mar 16, 2026
An unauthenticated arbitrary file upload vulnerability in Telesquare SKT LTE Router SDT-CS3B1 version 1.2.0 allows remote attackers to upload malicious files and execute code through improperly enabled WebDAV HTTP methods. Attackers can achieve remote code execution or denial of service without any authentication, making this a critical risk for exposed devices. Multiple proof-of-concept exploits are publicly available through security research publications.
RemediationAI
No patch information is available in the provided references. Immediate mitigation steps include: 1) Disable WebDAV functionality if possible through router configuration, 2) Implement network segmentation to prevent direct internet access to the management interface, 3) Deploy a web application firewall to block WebDAV methods (PUT, DELETE, MKCOL, MOVE, COPY, PROPPATCH), 4) Contact Telesquare for firmware updates or replacement options. The ZeroScience advisory (https://www.zeroscience.mk/en/vulnerabilities/ZSL-2017-5446.php) may contain additional technical details for validation and mitigation.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
The vulnerability stems from improperly configured WebDAV (Web Distributed Authoring and Versioning) implementation on the Telesquare SDT-CS3B1 LTE router running firmware version 1.2.0. WebDAV extends HTTP with methods like PUT, DELETE, MKCOL, MOVE, COPY, and PROPPATCH that enable file manipulation capabilities. The root cause (CWE-434: Unrestricted Upload of File with Dangerous Type) indicates the router fails to properly validate uploaded content or restrict access to these dangerous HTTP methods. The CPE identifier (cpe:2.3:a:telesquare:sdt-cs3b1:*:*:*:*:*:*:*:*) confirms this affects the SDT-CS3B1 model specifically.
Know when Sdt Cs3b1 gets its next vulnerability
- Watch products and get an email when something new is published
- Check this CVE against your own stack and servers
- Exploit and PoC references, threat intelligence from 22 sources
No credit card · 7-day full trial
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
Telesquare SKT LTE Router SDT-CS3B1 version 1.2.0 contains an arbitrary file upload vulnerability that allows unauthenticated attackers to upload malicious content by exploiting enabled WebDAV HTTP methods. Attackers can use PUT, DELETE, MKCOL, MOVE, COPY, and PROPPATCH methods to upload executable code, delete files, or manipulate server content for remote code execution or denial of service.
Executive ViewAI
Telesquare SKT LTE Router SDT-CS3B1 devices are exposed to unauthenticated remote code execution with no available patch. Any internet-facing device allows attackers to upload and execute malicious code without credentials, potentially enabling network compromise, data exfiltration, or service disruption across affected infrastructure.
Disable WebDAV HTTP methods using firewall ACLs or Web Application Firewall (WAF) rules; restrict network access to routers via IP whitelisting; segment router management traffic to isolated VLANs; implement network-based intrusion detection for exploit attempts; disable HTTP/HTTPS access ports if not operationally required; consider deploying reverse proxy with HTTP method filtering. These mitigations reduce exposure but do not eliminate risk—device replacement is mandatory.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Malicious file upload attacks exploit insufficient validation when web applications accept user-provided files.
Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
GitHub PoC
Exploit-DB