What is CVE-2026-109161?

CVE-2026-109161 is a medium-severity vulnerability in Welotec Tk100, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.9/10. Published 2026-11-03.

How severe is CVE-2026-109161?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Buffer overflow in Welotec Tk100

CVE-2026-109161

Insufficient bounds checking in the Digital I/O function may allow a remote attacker with high privileges to cause a denial of service.

Vulnerability class: Buffer Overflow

Published 2026-11-03 · last modified 2026-11-03.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.003 (22.8th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

The 30-day trend appears once there are two daily scores.

Affected products

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

www.certvde.com/en/advisories/VDE-2026-119/

Frequently asked questions

What is CVE-2026-109161?: CVE-2026-109161 is a medium-severity vulnerability in Welotec Tk100, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 4.9/10. Published 2026-11-03.
How severe is CVE-2026-109161?: Medium severity. CVSS v3 base score is 4.9 out of 10.