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CVE-2025-7862— TOTOLINK T6 Telnet Service cstecgi.cgi setTelnetCfg missing authentication

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版本存在访问控制错误漏洞，该漏洞源于Telnet服务中setTelnetCfg函数对参数telnet_enabled处理不当导致缺少身份验证。

CVSS 7.3 · High EPSS 1.07% · P64
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I. Basic Information for CVE-2025-7862

Vulnerability Information
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Vulnerability Title
TOTOLINK T6 Telnet Service cstecgi.cgi setTelnetCfg missing authentication
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in TOTOLINK T6 4.1.5cu.748_B20211015 and classified as critical. Affected by this vulnerability is the function setTelnetCfg of the file /cgi-bin/cstecgi.cgi of the component Telnet Service. The manipulation of the argument telnet_enabled with the input 1 leads to missing authentication. The attack can be launched 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:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
TOTOLINK T6 访问控制错误漏洞
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版本存在访问控制错误漏洞，该漏洞源于Telnet服务中setTelnetCfg函数对参数telnet_enabled处理不当导致缺少身份验证。
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-2025-7862

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9955 chars
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III. Intelligence Information for CVE-2025-7862

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Proof of Concept for CVE-2025-7862 (1)

Other References for CVE-2025-7862 (1)

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

CVE-2025-7913 8.8 HIGH TOTOLINK T6 MQTT Service updateWifiInfo buffer overflow
CVE-2025-7912 8.8 HIGH TOTOLINK T6 MQTT Service recvSlaveUpgstatus buffer overflow

IV. Related Vulnerabilities

Same product: T6
Same vendor: TOTOLINK
Same weakness: CWE-306

V. Comments for CVE-2025-7862

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