Is there a public PoC exploit available for CVE-2026-7856?

Yes, a public proof-of-concept exploit is available for CVE-2026-7856. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2026-7856?

Within 24 hours: inventory all D-Link DI-8100 routers in production and document current firmware versions. Within 7 days: implement network segmentation to restrict administrative access to management interfaces, require multi-factor authentication for admin accounts, and review access logs for suspicious administrative activity. Within 30 days: contact D-Link support for patch availability or firmware alternatives; if no patch emerges, evaluate replacement with alternative vendors and establish compensating controls for legacy devices that cannot be retired.

D-Link DI-8100 CVE-2026-7856

Q: What is the CVSS score of CVE-2026-7856?

CVE-2026-7856 has a CVSS 4.0 base score of 7.3 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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: 0.1%.

EUVD-2026-27486 HIGH

Classic Buffer Overflow (CWE-120)

2026-05-05 VulDB

D-Link Buffer Overflow

7.3

CVSS 4.0 · NVD

Severity by source

NVD PRIMARY

7.3 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/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:H/UI:N/VC:H/VI:H/VA:H/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

High

User Interaction

None

Scope

Lifecycle Timeline

Re-analysis Queued

May 05, 2026 - 20:22 vuln.today

cvss_changed

CVSS changed

May 05, 2026 - 20:22 NVD

7.2 (HIGH) 7.3 (HIGH)

Analysis Generated

May 05, 2026 - 20:00 vuln.today

DescriptionCVE.org

A flaw has been found in D-Link DI-8100 16.07.26A1. This affects an unknown part of the file /url_member.asp of the component Web Management Interface. Executing a manipulation of the argument Name can lead to buffer overflow. The attack can be launched remotely. The exploit has been published and may be used.

AnalysisAI

Buffer overflow in D-Link DI-8100 router firmware 16.07.26A1 allows authenticated administrators to execute arbitrary code via crafted 'Name' parameter to /url_member.asp in the web management interface. Public exploit code exists on GitHub, demonstrating active proof-of-concept availability. EPSS data unavailable; CVSS 7.2 reflects high impact but limited by requirement for high-privilege (admin) authentication, reducing real-world urgency for most organizations unless admin credentials are compromised or insider threat exists.

Technical ContextAI

The vulnerability affects the D-Link DI-8100 routing platform's web-based management interface, specifically in the /url_member.asp endpoint. The flaw is a classic buffer overflow (CWE-120) triggered by insufficient input validation on the 'Name' parameter. Buffer overflows occur when data written to a buffer exceeds its allocated memory boundary, allowing attackers to overwrite adjacent memory regions including return addresses and function pointers. In web management interfaces typically written in C/C++, lack of bounds checking on string operations (strcpy, sprintf, etc.) commonly causes this vulnerability class. The CPE identifier cpe:2.3:a:d-link:di-8100:*:*:*:*:*:*:*:* indicates the application-level firmware component is affected, with version 16.07.26A1 specifically identified.

RemediationAI

No vendor-released patch or updated firmware version has been identified in the available data at time of analysis. Until D-Link issues a security advisory with patched firmware, implement the following compensating controls with associated trade-offs: (1) Restrict access to the web management interface (/url_member.asp and entire admin panel) to trusted internal management networks only via firewall rules or router ACLs - blocks remote exploitation but requires VPN or jump host for legitimate remote administration. (2) Disable web-based management entirely if CLI/serial console access is viable for your operations - eliminates attack surface but increases administrative overhead. (3) Implement strong multi-factor authentication for all administrator accounts if supported by the platform - raises attacker cost but does not prevent exploitation after successful authentication. (4) Monitor admin session logs for unusual 'Name' parameter lengths or special characters in /url_member.asp requests - provides detection capability but no prevention. Check D-Link security advisories at https://www.dlink.com/ and the support portal for DI-8100 regularly for firmware updates. Consider replacing end-of-life hardware if D-Link discontinues security support for this model.