How to fix EUVD-2025-209321?

Within 24 hours: Identify all D-Link DI-8003 devices running firmware 16.07.26A1 in your environment and document their network criticality. Within 7 days: Implement network segmentation to restrict access to the qj.asp endpoint (implement firewall rules blocking HTTP requests to /qj.asp on affected devices; consider WAF rules if applicable). Within 30 days: Contact D-Link support for firmware update availability status; evaluate replacement or upgrade of critical DI-8003 units with alternative router models that have active vendor support.

Is D-Link affected by EUVD-2025-209321?

CVE-2025-50644 affects D-Link DI-8003 routers running firmware 16.07.26A1, exposing the device to unauthenticated remote denial-of-service attacks that can crash the router and disrupt network availability.

EUVD-2025-209321

| CVE-2025-50644 HIGH

2026-04-08 mitre

GHSA-9rgc-3p4m-823f

7.5

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Apr 08, 2026 - 19:31 vuln.today

EUVD ID Assigned

Apr 08, 2026 - 19:31 euvd

EUVD-2025-209321

CVE Published

Apr 08, 2026 - 00:00 nvd

HIGH 7.5

Description

A buffer overflow vulnerability exists in D-Link DI-8003 16.07.26A1 due to improper validation of user input in the qj.asp endpoint.

Analysis

Buffer overflow in D-Link DI-8003 router firmware 16.07.26A1 qj.asp endpoint enables unauthenticated remote denial-of-service attacks through malformed HTTP requests. Insufficient input validation allows attackers to trigger memory corruption, crashing the device and disrupting network services. Confidentiality and integrity remain intact per CVSS scoring, but availability impact is severe. No public exploit identified at time of analysis. EPSS indicates low observed exploitation activity.

Technical Context

CWE-120 classic buffer overflow in qj.asp HTTP handler. Firmware 16.07.26A1 fails to bounds-check user-supplied input before copying to fixed-size memory buffer, enabling stack/heap corruption. Network-accessible without authentication (CVSS AV:N/PR:N), low attack complexity (AC:L). Root cause: missing input length validation in web management interface.

Affected Products

D-Link DI-8003 router, firmware version 16.07.26A1. Vendor D-Link Corporation. CPE data insufficient for comprehensive version range identification. Enterprise-grade routing hardware with web-based administration vulnerable at unauthenticated endpoint.

Remediation

No vendor-released patch identified at time of analysis. Monitor D-Link security bulletin at https://www.dlink.com/en/security-bulletin/ for firmware updates addressing CVE-2025-50644. Immediate mitigations: restrict management interface access to trusted internal networks only via firewall rules, disable remote administration features, implement network-level access controls to qj.asp endpoint. Consider replacing affected devices if D-Link discontinues support for DI-8003 hardware. Verify device is not internet-exposed using network scanning. Consult NVD advisory at https://nvd.nist.gov/vuln/detail/CVE-2025-50644 for updated remediation guidance.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +38

POC: 0

EUVD-2025-209321 vulnerability details – vuln.today

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EUVD-2025-209321

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EUVD-2025-209321

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Lifecycle Timeline

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Description

Analysis

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