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TI-2026-84180 Aliases CVE-2026-105981GHSA-j6cj-3pf4-988r

Command Injection in Welotec Digital I/O

Priority LOW 39CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-78.

Summary

Improper input validation in the Digital I/O function of Welotec TK100, TK500-v2 and TK500-v3 devices lets a remote attacker with high privileges inject operating system commands (CWE-78) and run them with root privileges. The CVSS 4.0 base score is 8.6 (HIGH). CISA has not added the issue to KEV, and the CISA SSVC data lists exploitation as none, not automatable, with total technical impact.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

Improper input validation in the Digital I/O function may allow a remote attacker with high privileges to inject operating system commands and execute them with root privileges.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00358 29th percentileScored 2026-11-07
Fix Fixed TK100 (Welotec): 3.5.116TK500-v2 (Welotec): 1.0.124+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
WelotecTK1000.0.0 to before 3.5.1163.5.116Patch availableCNA
WelotecTK500-v20.0.0 to before 1.0.1241.0.124Patch availableCNA
WelotecTK500-v30.0.0 to before 1.0.1231.0.123Patch availableCNA
  • TK100 VendorWelotec Affected 0.0.0 to before 3.5.116 Fixed in 3.5.116 Patch available CNA
  • TK500-v2 VendorWelotec Affected 0.0.0 to before 1.0.124 Fixed in 1.0.124 Patch available CNA
  • TK500-v3 VendorWelotec Affected 0.0.0 to before 1.0.123 Fixed in 1.0.123 Patch available CNA

Remediation

Update TK100 to 3.5.116 or later, TK500-v2 to 1.0.124 or later, and TK500-v3 to 1.0.123 or later. All affected versions before these fixed releases are vulnerable.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

  • Fix · CNA TK100 (Welotec) Fixed in 3.5.116
  • Fix · CNA TK500-v2 (Welotec) Fixed in 1.0.124
  • Fix · CNA TK500-v3 (Welotec) Fixed in 1.0.123

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Welotec TK100, TK500-v2, TK500-v3 1.0.123, 1.0.124, 3.5.116

    6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW

    Other records, highest priority first

    • TI-2026-84181 Command injection in Welotec IPsec VPNPriority MEDIUM 40
    • TI-2026-84179 Command injection in Welotec WireGuard VPN functionPriority LOW 39
    • TI-2026-84177 Command injection in Welotec management control functionsPriority LOW 39
    Show all 6 records →

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-105981
  2. 2026-11-03 Alias added: GHSA-j6cj-3pf4-988r
  3. 2026-11-04 Priority changed: MEDIUM → LOW
  4. 2026-11-04 CISA SSVC decision points changed

References

Other 1

  • TI-2023-01026 Welotec: improper access control in TK500v1 router series CVSS 3.1CRITICAL 9.8
  • TI-2025-27665 egOS WebGUI Hard-Coded JWT Secret Enables Authentication Bypass CVSS 3.1CRITICAL 9.8
  • TI-2023-01025 Welotec: Command injection vulnerability in TK500v1 router series CVSS 3.1HIGH 8.8
  • TI-2025-27677 Path Traversal via 'Upload-Key' in SmartEMS Upload Handling CVSS 3.1HIGH 8.8
  • TI-2026-84181 Command injection in Welotec IPsec VPN CVSS 4.0HIGH 8.6
  • TI-2026-84179 Command injection in Welotec WireGuard VPN function CVSS 4.0HIGH 8.6
See all 10 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences