CVE-2026-7674: Libituo LBT-T300-HW1 Buffer Overflow Poses Remote Risk
A critical buffer overflow vulnerability, identified as CVE-2026-7674, has been discovered in Shenzhen Libituo Technology’s LBT-T300-HW1 router, affecting versions up to 1.2.8. The National Vulnerability Database reports that this flaw resides in the Web Management Interface’s start_single_service function.
Attackers can remotely exploit this by manipulating the vpn_pptp_server or vpn_l2tp_server arguments. This leads to a buffer overflow, with a CVSSv3.1 score of 8.8 (HIGH), indicating high impact on confidentiality, integrity, and availability. The National Vulnerability Database notes that the vendor has not responded to disclosure attempts.
This vulnerability is a stark reminder that network edge devices are prime targets. Unpatched routers are low-hanging fruit for initial access. An attacker gaining control of a router can pivot into the internal network, intercept traffic, or establish persistence, bypassing perimeter defenses designed for internal systems.
What This Means For You
- If your organization uses Shenzhen Libituo Technology LBT-T300-HW1 routers, immediately verify your firmware version. If it's 1.2.8 or earlier, assume it's vulnerable. Given the vendor's non-responsiveness, consider isolating these devices or replacing them entirely. Audit network traffic for unusual activity originating from or destined for these routers.
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-2026-7674
title: Web Application Exploitation Attempt — CVE-2026-7674
id: scw-2026-05-03-1
status: experimental
level: high
description: |
Detects common exploitation patterns targeting web applications. Review CVE-2026-7674 advisories for specific indicators.
author: SCW Feed Engine (auto-generated)
date: 2026-05-03
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7674/
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-2026-7674
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7674 | Buffer Overflow | Shenzhen Libituo Technology LBT-T300-HW1 up to 1.2.8 |
| CVE-2026-7674 | Buffer Overflow | Web Management Interface function start_single_service |
| CVE-2026-7674 | Buffer Overflow | Manipulation of argument vpn_pptp_server/vpn_l2tp_server |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 03, 2026 at 05:17 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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