Which versions of D-Link are affected by CVE-2026-4180?

D-Link DIR-816 routers running firmware 1.10CNB05 contain a publicly exploitable access control vulnerability that allows unauthenticated remote attackers to bypass authentication via parameter…

Is there a public PoC exploit available for CVE-2026-4180?

Yes, a public proof-of-concept exploit is available for CVE-2026-4180. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-4180?

Within 24 hours: Inventory all D-Link DIR-816 devices in production and isolate any affected units from critical networks; document current firmware versions and network topology. Within 7 days: Replace affected routers with supported alternatives from the vendor or evaluate network architecture to eliminate dependency on this unsupported device; if replacement is impossible, implement network segmentation to restrict access to the device's web interface. Within 30 days: Complete full device replacement or retirement; conduct access logs review for any signs of prior exploitation.

D-Link CVE-2026-4180

Q: What is the CVSS score of CVE-2026-4180?

CVE-2026-4180 has a CVSS 4.0 base score of 5.5 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X. EPSS exploitation probability: 0.0%.

EUVD-2026-12231 MEDIUM

Improper Access Control (CWE-284)

2026-03-15 VulDB

Authentication Bypass D-Link

5.5

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Lifecycle Timeline

Severity Changed

Apr 29, 2026 - 01:11 NVD

HIGH MEDIUM

CVSS changed

Apr 29, 2026 - 01:11 NVD

7.3 (HIGH) 5.5 (MEDIUM)

PoC Detected

Mar 16, 2026 - 14:53 vuln.today

Public exploit code

EUVD ID Assigned

Mar 15, 2026 - 14:00 euvd

EUVD-2026-12231

Analysis Generated

Mar 15, 2026 - 14:00 vuln.today

CVE Published

Mar 15, 2026 - 13:32 nvd

HIGH 7.3

DescriptionCVE.org

A vulnerability was identified in D-Link DIR-816 1.10CNB05. The impacted element is an unknown function of the file redirect.asp of the component goahead. The manipulation of the argument token_id leads to improper access controls. The attack may be initiated remotely. The exploit is publicly available and might be used. This vulnerability only affects products that are no longer supported by the maintainer.

AnalysisAI

CVE-2026-4180 is an authentication bypass vulnerability in the D-Link DIR-816 router (version 1.10CNB05) affecting the redirect.asp file in the goahead component, allowing remote attackers to gain unauthorized access without authentication. A public proof-of-concept exploit is available and the affected product is no longer supported by D-Link, making this vulnerability permanently unpatched.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Send HTTP request to redirect.asp

Exploit

Manipulate token_id parameter

Execution

Bypass access controls

Impact

Access unauthorized resources

Access

Send HTTP request to redirect.asp

Exploit

Manipulate token_id parameter

Execution

Bypass access controls

Impact

Access unauthorized resources

Vulnerability AssessmentAI

Exploitation	D-Link DIR-816 firmware version 1.10CNB05 or earlier with goahead web server enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment	This vulnerability presents moderate to high real-world risk. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario	An attacker can remotely exploit this vulnerability by sending specially crafted HTTP requests to the redirect.asp page with manipulated token_id parameters, bypassing authentication controls. Since no authentication or user interaction is required, automated scanning and exploitation is feasible. …
Remediation	No patch is available as the D-Link DIR-816 is no longer supported by the manufacturer. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours: Inventory all D-Link DIR-816 devices in production and isolate any affected units from critical networks; document current firmware versions and network topology. …

Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-4180 vulnerability details – vuln.today

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