Vulnerability · Published Mar 15, 2026 · Assigned by VulDB

CVE-2026-4181D-Link DIR-816 goahead form2RepeaterStep2.cgi stack-based overflow

Critical 9.8

In plain English

A critical-severity stack buffer overflow in DIR-816 from D-Link. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.2%top 30.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 stack-based buffer overflow. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks. This vulnerability only affects products that are no longer supported by the maintainer.

Affected products (as reported)

Vendor	Product	Versions
D-Link	DIR-816	1.10CNB05

Weakness: CWE-121, CWE-119 · 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

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
https://github.com/wudipjq/my_vuln/blob/main/D-Link7/vuln_85/85.md exploit
https://www.dlink.com/ product