Totolink N300RT: High-Severity Buffer Overflow Vulnerability (CVE-2026-7219)
The National Vulnerability Database has detailed CVE-2026-7219, a high-severity buffer overflow flaw impacting Totolink N300RT firmware version 3.4.0-B20250430. This vulnerability, stemming from improper handling of the entry_name argument within the /boafrm/formIpQoS function, allows for remote execution of a buffer overflow. This isn’t theoretical; a public exploit exists, making this a clear and present danger.
A buffer overflow in a network device like a router is a critical issue. It often leads to remote code execution, giving attackers full control over the device. Given the public availability of an exploit, any unpatched Totolink N300RT routers running the affected firmware are sitting ducks. Attackers can leverage this to pivot into internal networks, intercept traffic, or establish persistence within an organization’s infrastructure.
While the National Vulnerability Database did not specify affected products beyond the firmware version, the implication is clear: if you run this specific Totolink N300RT model with the vulnerable firmware, you are exposed. The CVSS score of 7.2 (HIGH) and the vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H underscore the ease of exploitation (network-adjacent, low complexity, no user interaction, high impact on confidentiality, integrity, and availability). This is a direct shot at the network edge.
What This Means For You
- If your organization uses Totolink N300RT routers, immediately verify your firmware version. Any device running 3.4.0-B20250430 is vulnerable to CVE-2026-7219, and a public exploit is available. Prioritize patching or isolating these devices to prevent a network-wide compromise.
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-2026-7219
title: Web Application Exploitation Attempt — CVE-2026-7219
id: scw-2026-04-28-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-7219 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-04-28
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7219/
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-2026-7219
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7219 | Buffer Overflow | Totolink N300RT firmware version 3.4.0-B20250430 |
| CVE-2026-7219 | Buffer Overflow | Vulnerable file: /boafrm/formIpQoS |
| CVE-2026-7219 | Buffer Overflow | Vulnerable argument: entry_name |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 28, 2026 at 07:16 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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