D-Link DI-8100 Critical Buffer Overflow Vulnerability (CVE-2026-7248)
The National Vulnerability Database has identified a critical buffer overflow vulnerability, CVE-2026-7248, affecting D-Link DI-8100 routers running firmware version 16.07.26A1. This flaw resides within the tgfile.htm CGI endpoint, specifically in the tgfile_htm function. Attackers can exploit a manipulated ‘fn’ argument to trigger a buffer overflow, potentially leading to remote code execution with high impact on confidentiality, integrity, and availability. The CVSS score of 9.8 underscores the severity of this threat.
Given the remote and unauthenticated nature of this attack vector and the public availability of exploit details, organizations relying on these D-Link devices face an immediate and significant risk. The National Vulnerability Database notes that affected products beyond the specific firmware version were not detailed, but any deployment of this firmware is a prime target. Defenders must prioritize patching or isolating these devices to prevent compromise.
What This Means For You
- If your organization uses D-Link DI-8100 routers with firmware 16.07.26A1, you must immediately patch the firmware or, if patching is not feasible, implement network segmentation to isolate these devices from critical systems and the internet. Audit your network for any instances of this device and verify the firmware version.
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.
CVE-2026-7248 - D-Link DI-8100 tgfile.htm Buffer Overflow
title: CVE-2026-7248 - D-Link DI-8100 tgfile.htm Buffer Overflow
id: scw-2026-04-28-ai-1
status: experimental
level: critical
description: |
Detects attempts to exploit the CVE-2026-7248 vulnerability in D-Link DI-8100 devices. This rule specifically looks for requests targeting the 'tgfile.htm' endpoint with a 'fn=' parameter, which is indicative of the buffer overflow exploit targeting the CGI endpoint.
author: SCW Feed Engine (AI-generated)
date: 2026-04-28
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7248/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri|contains:
- '/tgfile.htm'
cs-uri-query|contains:
- 'fn='
cs-method|exact:
- 'GET'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7248 | Vulnerability | CVE-2026-7248 |
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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