CVE-2025-7862: t6 Auth Bypass — Exploit

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.

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CVSS v3.1 Score

7.3

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Weakness Type (CWE)

CWE-287 Improper Authentication

CWE-306 Missing Authentication

Affected Products

Vendor	Product	Versions
totolink	t6_firmware	All
totolink	t6	All

References

Exploits

https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http https://www.youtube.com/watch?v=XeKu3tfeSME https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http https://www.youtube.com/watch?v=XeKu3tfeSME

Other References

https://vuldb.com/?ctiid.316975 https://vuldb.com/?id.316975 https://vuldb.com/?submit.617643 https://www.totolink.net/

Frequently Asked Questions

What is CVE-2025-7862? +

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. It has a CVSS v3.1 base score of 7.3 (HIGH).

How severe is CVE-2025-7862? +

CVE-2025-7862 has a CVSS v3.1 score of 7.3 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-7862? +

CVE-2025-7862 affects products from totolink, specifically: t6, t6_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-7862? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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