D-Link DI-8100 Buffer Overflow: CVE-2026-7247 Exposes Remote Exploitation Risk
The National Vulnerability Database has identified CVE-2026-7247, a critical buffer overflow vulnerability impacting D-Link DI-8100 routers running firmware version 16.07.26A1. The flaw resides within the File Extension Handler component, specifically in the file_exten.asp file’s file_exten_asp function. Attackers can exploit this by manipulating the ‘Name’ argument, triggering a buffer overflow that allows for remote code execution. The public disclosure of this exploit means it is likely already in the hands of malicious actors.
This vulnerability carries a CVSS score of 7.2 (HIGH), indicating a significant risk. While the specific affected products beyond the DI-8100 model are not detailed, the remote nature of the exploit and the potential for full system compromise make this a serious concern for organizations relying on D-Link network infrastructure. Defenders must prioritize patching or mitigating this vulnerability to prevent unauthorized access and potential network takeover.
What This Means For You
- If your organization utilizes D-Link DI-8100 routers with firmware 16.07.26A1, you must immediately investigate and apply any available patches from D-Link. Given the public exploit, assume this device is a target. Audit your network for these devices and consider segmenting them or replacing them if patching is not feasible.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
D-Link DI-8100 file_exten.asp Buffer Overflow - CVE-2026-7247
title: D-Link DI-8100 file_exten.asp Buffer Overflow - CVE-2026-7247
id: scw-2026-04-28-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit the buffer overflow vulnerability in the D-Link DI-8100's file_exten.asp component by targeting the 'Name' parameter. This is the primary detection for the initial exploitation of CVE-2026-7247.
author: SCW Feed Engine (AI-generated)
date: 2026-04-28
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7247/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/file_exten.asp'
cs-uri-query|contains:
- 'Name='
cs-method:
- 'POST'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7247 | Vulnerability | CVE-2026-7247 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 28, 2026 at 12:16 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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