What is the CVSS score of CVE-2026-4182?

CVE-2026-4182 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-2026-4182?

A critical remote code execution vulnerability (CVSS 9.8) has been identified in D-Link DIR-816 wireless routers with public exploit code available.

Is there a public PoC exploit available for CVE-2026-4182?

Yes, a public proof-of-concept exploit is available for CVE-2026-4182. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-4182?

Within 24 hours: Inventory all D-Link DIR-816 devices across the organization and isolate any identified units from production networks. Within 7 days: Either decommission affected devices or implement network-level mitigations (see compensating controls). Within 30 days: Complete replacement with supported hardware and validate remediation through vulnerability scanning.

Dir 816 CVE-2026-4182

EUVD-2026-12235 CRITICAL

Stack-based Buffer Overflow (CWE-121)

2026-03-15 VulDB

Buffer Overflow D-Link Stack Overflow Dir 816 D-Link

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

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 - 17:00 euvd

EUVD-2026-12235

Analysis Generated

Mar 15, 2026 - 17:00 vuln.today

CVE Published

Mar 15, 2026 - 16:02 nvd

CRITICAL 9.8

DescriptionCVE.org

A weakness has been identified in D-Link DIR-816 1.10CNB05. This impacts an unknown function of the file /goform/form2Wl5RepeaterStep2.cgi of the component goahead. This manipulation of the argument key1/key2/key3/key4/pskValue causes stack-based buffer overflow. Remote exploitation of the attack is possible. The exploit has been made available to the public and could be used for attacks. 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 achieve full system compromise without authentication. A public proof-of-concept exploit is available on GitHub, and the vulnerability affects end-of-life products no longer supported by D-Link, making this a high-risk issue for organizations still using these devices.

Technical ContextAI

The vulnerability exists in the goahead web server component, specifically in the /goform/form2Wl5RepeaterStep2.cgi file which handles wireless repeater configuration. The flaw is a classic stack-based buffer overflow (CWE-121) where input parameters (key1/key2/key3/key4/pskValue) are not properly bounds-checked before being copied to stack buffers. The affected product CPE is cpe:2.3:a:d-link:dir-816:*:*:*:*:*:*:*:*, indicating all versions of the DIR-816 router are potentially vulnerable, though the specific confirmed version is 1.10CNB05.

RemediationAI

As this affects end-of-life products with no vendor support, the only effective remediation is to replace affected DIR-816 routers with supported models. Temporary mitigations include: 1) Disable remote management interfaces if possible, 2) Place the device behind a firewall blocking external access to the management interface, 3) Monitor for exploitation attempts targeting /goform/form2Wl5RepeaterStep2.cgi. No patches are available as confirmed by the RL:X (Unavailable) metric in the CVSS string.