What is CVE-2026-4181?

CVE-2026-4181 is a critical-severity vulnerability in D-link Dir-816, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-03-15.

How severe is CVE-2026-4181?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in D-link Dir-816

CVE-2026-4181

A security flaw has been discovered in D-Link DIR-816 1.10CNB05. This affects an unknown function of the file /goform/form2RepeaterStep2.cgi of the component goahead. The manipulation of the argument key1/key2/key3/key4/pskValue results in…

Vulnerability class: Buffer Overflow

EPSS: 0.003 (52.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R.

Affected products

D-link Dir-816 — versions 1.10CNB05

Weakness classification (CWE)

References

VDB-351085 | D-Link DIR-816 goahead form2RepeaterStep2.cgi stack-based overflow (vdb-entry, technical-description)
VDB-351085 | CTI Indicators (IOB, IOC, IOA) (signature, permissions-required)
Submit #769829 | D-Link DIR816 1.10CNB05 Stack-based Buffer Overflow (third-party-advisory)
github.com/wudipjq/my_vuln/blob/main/D-Link7/vuln_85/85.md (exploit)
www.dlink.com/ (product)

Frequently asked questions

What is CVE-2026-4181?: CVE-2026-4181 is a critical-severity vulnerability in D-link Dir-816, classified under Stack-based Buffer Overflow. CVSS score: 9.8/10. Published 2026-03-15.
How severe is CVE-2026-4181?: Critical severity. CVSS v3 base score is 9.8 out of 10.