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CVE-2025-8170— TOTOLINK T6 MQTT Packet meshSlaveDlfw tcpcheck_net buffer overflow

Quick assessment

Affected
TOTOLINK T6
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

TOTOLINK T6是中国吉翁电子（TOTOLINK）公司的一款无线双频路由器。 TOTOLINK T6 4.1.5cu.748_B20211015版本存在安全漏洞，该漏洞源于MQTT数据包处理组件中文件/router/meshSlaveDlfw对参数serverIp的错误操作导致缓冲区溢出。

CVSS 8.8 · High EPSS 1.11% · P65

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-8170

Vulnerability Information
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Vulnerability Title
TOTOLINK T6 MQTT Packet meshSlaveDlfw tcpcheck_net buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability classified as critical was found in TOTOLINK T6 4.1.5cu.748_B20211015. This vulnerability affects the function tcpcheck_net of the file /router/meshSlaveDlfw of the component MQTT Packet Handler. The manipulation of the argument serverIp leads to buffer overflow. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK T6 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
TOTOLINK T6是中国吉翁电子（TOTOLINK）公司的一款无线双频路由器。 TOTOLINK T6 4.1.5cu.748_B20211015版本存在安全漏洞，该漏洞源于MQTT数据包处理组件中文件/router/meshSlaveDlfw对参数serverIp的错误操作导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
TOTOLINK T6 4.1.5cu.748_B20211015 -

II. Public POCs for CVE-2025-8170

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10583 chars
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III. Intelligence Information for CVE-2025-8170

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Same Patch Batch · TOTOLINK · 2025-07-25 · 6 CVEs total

CVE-2025-8136 8.8 HIGH TOTOLINK A702R HTTP POST Request formFilter buffer overflow
CVE-2025-8137 8.8 HIGH TOTOLINK A702R HTTP POST Request formIpQoS buffer overflow
CVE-2025-8138 8.8 HIGH TOTOLINK A702R HTTP POST Request formOneKeyAccessButton buffer overflow
CVE-2025-8139 8.8 HIGH TOTOLINK A702R HTTP POST Request formPortFw buffer overflow
CVE-2025-8140 8.8 HIGH TOTOLINK A702R HTTP POST Request formWlanMultipleAP buffer overflow

IV. Related Vulnerabilities

Same product: T6
Same vendor: TOTOLINK
Same weakness: CWE-120

V. Comments for CVE-2025-8170

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