How to fix EUVD-2025-209311?

Within 24 hours: Identify all D-Link DI-8300 devices running firmware v16.07.26A1 in your network and document their locations and criticality. Within 7 days: Implement network segmentation to restrict external access to affected routers and monitor for suspicious traffic patterns targeting the tgfile_htm function. Within 30 days: Contact D-Link support for firmware update availability; if no patch is released, evaluate router replacement or deployment of a WAF/IPS rule to block malformed requests to the vulnerable parameter.

Is D-Link affected by EUVD-2025-209311?

CVE-2025-45059 is a high-severity buffer overflow affecting D-Link DI-8300 routers running firmware v16.07.26A1 that allows unauthenticated remote attackers to cause denial of service.

EUVD-2025-209311

| CVE-2025-45059 HIGH

2026-04-08 mitre

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 - 18:16 vuln.today

EUVD ID Assigned

Apr 08, 2026 - 18:16 euvd

EUVD-2025-209311

CVE Published

Apr 08, 2026 - 00:00 nvd

HIGH 7.5

Description

D-Link DI-8300 v16.07.26A1 was discovered to contain a buffer overflow via the fn parameter in the tgfile_htm function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.

Analysis

Buffer overflow in D-Link DI-8300 router firmware v16.07.26A1 enables unauthenticated remote attackers to trigger denial of service conditions via malformed input to the fn parameter in tgfile_htm function. Network-accessible attack vector requires no privileges or user interaction. CVSS 7.5 (High) reflects availability impact. No public exploit identified at time of analysis. Low observed exploitation activity (EPSS 0.02%).

Technical Context

CWE-120 classic buffer overflow in tgfile_htm handler function fails to validate fn parameter length before memory copy operation. Network-reachable attack surface (AV:N) and low complexity (AC:L) indicate direct HTTP request exploitation without authentication barriers (PR:N). Memory corruption limited to availability disruption (A:H), suggesting stack/heap exhaustion rather than control-flow hijack.

Affected Products

D-Link DI-8300 industrial-grade router, firmware version 16.07.26A1. Vendor: D-Link Corporation. Specific CPE unavailable from authoritative sources. Single confirmed vulnerable version with no indication of broader version range impact.

Remediation

No vendor-released patch identified at time of analysis. D-Link has not published firmware updates addressing CVE-2025-45059 per security bulletin review (https://www.dlink.com/en/security-bulletin/). Recommended immediate mitigations: (1) restrict network access to DI-8300 management interface via firewall rules limiting source IPs to trusted administrative subnets, (2) disable remote management features if operationally feasible, (3) implement intrusion prevention signatures detecting abnormal HTTP parameter lengths to tgfile_htm endpoint, (4) monitor vendor advisory page for forthcoming patches. Organizations requiring continuous availability should evaluate alternative routing hardware until remediation becomes available. Contact D-Link technical support for product-specific guidance and patch roadmap: https://www.dlink.com.cn/techsupport/ProductInfo.aspx?m=DI-8300

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +38

POC: 0

EUVD-2025-209311 vulnerability details – vuln.today

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EUVD-2025-209311

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EUVD-2025-209311

CVSS Vector

Lifecycle Timeline

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Description

Analysis

Technical Context

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