Telesquare SKT LTE Router SDT-CS3B1 CSRF System Command Execution
Telesquare SKT LTE Router SDT-CS3B1 version 1.2.0 contains a cross-site request forgery vulnerability that allows authenticated attackers to execute arbitrary system commands by exploiting missing request validation. Attackers can craft malicious web pages that perform administrative actions when visited by logged-in users, enabling command execution with router privileges.
- Published
- Mar 16, 2026
- Updated
- Jun 16, 2026
- EPSS
- 0.3% · 19th percentile
- CWE
- CWE-352
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Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · VulnCheck
- 5.3
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| telesquare | sdt-cs3b1 firmware | cpe:2.3:o:telesquare:sdt-cs3b1_firmware |
| telesquare | sdt-cs3b1 | cpe:2.3:h:telesquare:sdt-cs3b1 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- telesquare sdt-cs3b1 firmware1.2.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.
Telesquare SDT-CS3B1
- 1.2.0affected
Same product
telesquare: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-46422Telesquare SDT-CW3B1 1.1.0 is affected by an OS command injection vulnerability that allows a remote attacker to execute OS commands without67This week
- CVE-2018-12526Telesquare SDT-CS3B1 and SDT-CW3B1 devices through 1.2.0 have a default factory account.40Plan
- CVE-2017-20224Telesquare SKT LTE Router SDT-CS3B1 WebDAV Arbitrary File Upload37Monitor
- CVE-2017-20223Telesquare SKT LTE Router SDT-CS3B1 Insecure Direct Object Reference37Monitor
- CVE-2017-20222Telesquare SKT LTE Router SDT-CS3B1 Unauthenticated Remote Reboot34Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
No fix version is recorded for this entry. Check the references for vendor advisories.
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- LiquidWorm as Gjoko KrsticZero Science Labfinder
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
—
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
- CVE-2017-202220 days apartTelesquare SKT LTE Router SDT-CS3B1 Unauthenticated Remote Reboot34Monitor
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- X
Weakness class (CWE)
CWE-352 · Cross-Site Request Forgery (CSRF)CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
nvd-secondary
Root cause
State-changing requests rely on the session cookie the browser sends automatically; nothing verifies that the request came from the user’s own page.
The bug in code
The whole CWE-352 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
app.use(session({ cookie: { httpOnly: true } }));app.post("/account/address", updateAddress);Fixed
app.use(session({ cookie: { httpOnly: true, sameSite: "lax" } }));app.post("/account/address", csrfProtection, updateAddress);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.
References
- cxsecurity.com/issue/WLB-2017120299
- exchange.xforce.ibmcloud.com/vulnerabilities/136839
- www.vulncheck.com/advisories/telesquare-skt-lte-router-sdt-cs3b1-csrf-system-command-execution
Vendor advisories and official records. Exploit/PoC links are deliberately left out.