What is the CVSS score of CVE-2026-4184?

CVE-2026-4184 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.1%.

Which versions of Dir 816 are affected by CVE-2026-4184?

A critical remote code execution vulnerability (CVE-2026-4184, CVSS 9.8) affects D-Link DIR-816 routers with publicly available exploits.

Is there a public PoC exploit available for CVE-2026-4184?

Yes, a public proof-of-concept exploit is available for CVE-2026-4184. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-4184?

Within 24 hours: Identify and inventory all D-Link DIR-816 devices on the network and isolate them from critical systems. Within 7 days: Develop an emergency replacement plan for affected devices and communicate timelines to stakeholders. Within 30 days: Complete replacement of all vulnerable DIR-816 units with supported, current-generation network equipment.

Dir 816 CVE-2026-4184

EUVD-2026-12239 CRITICAL

Stack-based Buffer Overflow (CWE-121)

2026-03-15 VulDB

Buffer Overflow D-Link Stack Overflow Dir 816

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

PoC Detected

Mar 16, 2026 - 14:53 vuln.today

Public exploit code

EUVD ID Assigned

Mar 15, 2026 - 18:00 euvd

EUVD-2026-12239

Analysis Generated

Mar 15, 2026 - 18:00 vuln.today

CVE Published

Mar 15, 2026 - 17:32 nvd

CRITICAL 9.8

DescriptionCVE.org

A vulnerability was detected in D-Link DIR-816 1.10CNB05. Affected by this vulnerability is an unknown functionality of the file /goform/form2Wl5BasicSetup.cgi of the component goahead. Performing a manipulation of the argument pskValue results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

AnalysisAI

Critical stack-based buffer overflow vulnerability in the D-Link DIR-816 router (version 1.10CNB05) that allows remote attackers to execute arbitrary code without authentication. A public proof-of-concept exploit is available on GitHub, making this vulnerability actively exploitable. However, D-Link no longer supports this product, meaning no patch will be released.

Technical ContextAI

The vulnerability exists in the goahead web server component, specifically in the /goform/form2Wl5BasicSetup.cgi file that handles wireless configuration settings. The flaw (CWE-121: Stack-based Buffer Overflow) occurs when the 'pskValue' parameter is processed without proper bounds checking, allowing an attacker to overflow the stack buffer. Based on the CPE string (cpe:2.3:a:d-link:dir-816:*:*:*:*:*:*:*:*), all versions of the DIR-816 firmware may be affected, though only version 1.10CNB05 has been confirmed vulnerable.

RemediationAI

Since D-Link no longer supports the DIR-816 router, no official patch will be released. Organizations must immediately replace these devices with supported alternatives. As temporary mitigations: (1) Disable remote management if enabled, (2) Restrict access to the web interface using firewall rules to trusted IP addresses only, (3) Monitor for suspicious traffic to /goform/form2Wl5BasicSetup.cgi. The vendor's general security information can be found at https://www.dlink.com/, but no specific advisory exists for this EOL product.