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CVE-2025-7913— TOTOLINK T6 MQTT Service updateWifiInfo 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，该漏洞源于对MQTT Service中参数serverIp的错误操作导致缓冲区溢出。

CVSS 8.8 · High EPSS 0.85% · P57
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I. Basic Information for CVE-2025-7913

Vulnerability Information
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Vulnerability Title
TOTOLINK T6 MQTT Service updateWifiInfo buffer overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability, which was classified as critical, was found in TOTOLINK T6 4.1.5cu.748_B20211015. Affected is the function updateWifiInfo of the component MQTT Service. The manipulation of the argument serverIp leads to buffer overflow. It is possible to launch the attack 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，该漏洞源于对MQTT Service中参数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-2025-7913

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7999 chars
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III. Intelligence Information for CVE-2025-7913

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Same Patch Batch · TOTOLINK · 2025-07-20 · 3 CVEs total

CVE-2025-7912 8.8 HIGH TOTOLINK T6 MQTT Service recvSlaveUpgstatus buffer overflow
CVE-2025-7862 7.3 HIGH TOTOLINK T6 Telnet Service cstecgi.cgi setTelnetCfg missing authentication

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-7913

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