CVE-2026-109161: Welotec TK router buffer overflow in Digital I/O function
CVE-2026-109161 · Severity: medium · CVSS 4.9 · Published 2026-11-03
Welotec TK routers are industrial network appliances used to provide VPN and remote connectivity for critical infrastructure. A buffer overflow vulnerability in the Digital I/O management function allows a remote attacker with administrative privileges to trigger a denial of service condition, disrupting network connectivity and operations.
No. Junglewise Threat Intelligence has no report of CVE-2026-109161 being exploited in the wild.
How severe is CVE-2026-109161?
Medium severity, with a CVSS score of 4.9, published 3 November 2026.
Which products and versions are affected?
Welotec TK100 before 3.5.116; Welotec TK500-v2 before 1.0.124; Welotec TK500-v3 before 1.0.123.
Is there a fix for CVE-2026-109161?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-109161 attacked?
It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-109161?
Check whether you run Welotec TK100, Welotec TK500-v2 or Welotec TK500-v3 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.