D-Link DI-8100 Buffer Overflow (CVE-2026-7856) Exposes Web Management
A critical buffer overflow vulnerability, identified as CVE-2026-7856, has been discovered in the D-Link DI-8100 router, specifically affecting version 16.07.26A1. The National Vulnerability Database reports this flaw resides within the device’s Web Management Interface, specifically in the /url_member.asp component.
Attackers can trigger this vulnerability remotely by manipulating the Name argument, leading to a buffer overflow. This remote exploit capability is particularly concerning, as it allows adversaries to compromise affected devices without direct physical access. The National Vulnerability Database has assigned this vulnerability a CVSS score of 7.2 (HIGH), underscoring its severity and the potential for significant impact, including high confidentiality, integrity, and availability compromise.
The exploit code for CVE-2026-7856 has already been published, meaning this isn’t a theoretical threat — it’s an active one. Defenders must assume that attackers are already leveraging this information. For organizations or individuals still running D-Link DI-8100 16.07.26A1, this represents an immediate and exploitable risk.
What This Means For You
- If your organization utilizes D-Link DI-8100 routers, specifically version 16.07.26A1, you must immediately assess your exposure to CVE-2026-7856. Given the public availability of exploit code, these devices are prime targets for remote compromise. Prioritize patching or isolating these devices without delay. Conduct a thorough audit of any D-Link DI-8100 devices to ensure they are not internet-facing and are running the latest, patched firmware.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-7856 D-Link DI-8100 Web Management Buffer Overflow Attempt
title: CVE-2026-7856 D-Link DI-8100 Web Management Buffer Overflow Attempt
id: scw-2026-05-05-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit CVE-2026-7856 by targeting the /url_member.asp endpoint with a POST request and manipulating the 'Name' parameter, which is known to trigger a buffer overflow in the D-Link DI-8100 Web Management Interface.
author: SCW Feed Engine (AI-generated)
date: 2026-05-05
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7856/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/url_member.asp'
cs-uri-query|contains:
- 'Name='
cs-method|exact:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7856 | Buffer Overflow | D-Link DI-8100 version 16.07.26A1 |
| CVE-2026-7856 | Buffer Overflow | Web Management Interface component |
| CVE-2026-7856 | Buffer Overflow | Vulnerable file: /url_member.asp |
| CVE-2026-7856 | Buffer Overflow | Vulnerable argument: Name |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 05, 2026 at 23:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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