D-Link DI-8100 Buffer Overflow - CVE-2026-7855 Public Exploit Available
The National Vulnerability Database has identified CVE-2026-7855, a critical buffer overflow vulnerability impacting D-Link DI-8100 routers, specifically firmware version 16.07.26A1. The flaw resides within the HTTP Request Handler’s /tggl.asp file, allowing remote attackers to trigger a buffer overflow by manipulating the ‘Name’ argument. This vulnerability carries a CVSS score of 8.8 (HIGH), indicating a significant risk.
With a public exploit now available, this issue poses an immediate threat to organizations relying on these D-Link devices. Attackers can leverage this vulnerability remotely without requiring any special privileges or user interaction, making it a prime target for initial network access or lateral movement. The implications of a successful exploit range from sensitive data exfiltration to full device compromise.
Defenders must prioritize patching or isolating affected D-Link DI-8100 routers immediately. Network segmentation and strict access controls for the management interface are crucial. Organizations should also conduct thorough network audits to identify any instances of these vulnerable devices and review logs for signs of compromise, particularly any unusual HTTP requests targeting the /tggl.asp endpoint.
What This Means For You
- If your organization utilizes D-Link DI-8100 routers with firmware 16.07.26A1, you must patch this device or disconnect it from the internet immediately. The availability of a public exploit for CVE-2026-7855 means attackers can easily compromise these devices remotely, potentially gaining a foothold into your network.
Related ATT&CK Techniques
🛡️ Detection Rules
5 rules · 6 SIEM formats5 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.
Web Application Exploitation Attempt — CVE-2026-7855
title: Web Application Exploitation Attempt — CVE-2026-7855
id: scw-2026-05-05-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-7855 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-05-05
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7855/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: webserver
detection:
selection:
cs-uri-query|contains:
- '..'
- 'SELECT'
- 'UNION'
- '<script'
- 'cmd='
- '/etc/passwd'
condition: selection
falsepositives:
- Legitimate activity from CVE-2026-7855
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7855 | Vulnerability | CVE-2026-7855 |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 05, 2026 at 22:16 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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