Which versions of Dir 806 Firmware are affected by CVE-2025-4340?

Organizations using D-Link DIR-890L and DIR-806A1 should be aware of moderate risk from CVE-2025-4340, a injection vulnerability rated CVSS 5.3.

Is there a public PoC exploit available for CVE-2025-4340?

Yes, a public proof-of-concept exploit is available for CVE-2025-4340. Prioritise patching immediately. EPSS: 2.4%.

How to fix or mitigate CVE-2025-4340?

Within 30 days: Identify affected systems running D-Link DIR-890L and DIR-806A1 and apply vendor patches as part of regular patch cycle. Validate input sanitization for user-controlled parameters.

Dir 806 Firmware CVE-2025-4340

Q: What is the CVSS score of CVE-2025-4340?

CVE-2025-4340 has a CVSS 4.0 base score of 5.3 (Medium). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/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: 2.4%.

MEDIUM

Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (CWE-74)

2025-05-06 cna@vuldb.com

Command Injection D-Link Dir 806 Firmware Dir 890L Firmware

5.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

5.3 MEDIUM

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:40 vuln.today

PoC Detected

May 13, 2025 - 20:25 vuln.today

Public exploit code

CVE Published

May 06, 2025 - 08:15 nvd

MEDIUM 5.3

DescriptionCVE.org

A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Affected is the function sub_175C8 of the file /htdocs/soap.cgi. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

AnalysisAI

A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified under CWE-74. A vulnerability classified as critical has been found in D-Link DIR-890L and DIR-806A1 up to 100CNb11/108B03. Affected is the function sub_175C8 of the file /htdocs/soap.cgi. The manipulation leads to command injection. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer. Affected products include: Dlink Dir-806 Firmware, Dlink Dir-890L Firmware. Version information: up to 100.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.