9.8
CRITICAL
CVE-2025-7862
"TOTOLINK Telnet Service Remote Authentication Bypass"
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.

INFO

Published Date :

July 20, 2025, 3:15 a.m.

Last Modified :

July 23, 2025, 4:27 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2025-7862 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Totolink t6_firmware
2 Totolink t6
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-7862.

URL Resource
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md Exploit Third Party Advisory
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http Exploit Third Party Advisory
https://vuldb.com/?ctiid.316975 Permissions Required
https://vuldb.com/?id.316975 Third Party Advisory VDB Entry
https://vuldb.com/?submit.617643 Third Party Advisory VDB Entry
https://www.totolink.net/ Product
https://www.youtube.com/watch?v=XeKu3tfeSME Exploit
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md Exploit Third Party Advisory
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http Exploit Third Party Advisory
https://www.youtube.com/watch?v=XeKu3tfeSME Exploit

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-7862 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2025-7862 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jul. 23, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CPE Configuration AND OR *cpe:2.3:o:totolink:t6_firmware:v4.1.5cu.748_b20211015:*:*:*:*:*:*:* OR cpe:2.3:h:totolink:t6:3:*:*:*:*:*:*:*
    Added Reference Type CISA-ADP: https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md Types: Exploit, Third Party Advisory
    Added Reference Type VulDB: https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md Types: Exploit, Third Party Advisory
    Added Reference Type CISA-ADP: https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http Types: Exploit, Third Party Advisory
    Added Reference Type VulDB: https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http Types: Exploit, Third Party Advisory
    Added Reference Type VulDB: https://vuldb.com/?ctiid.316975 Types: Permissions Required
    Added Reference Type VulDB: https://vuldb.com/?id.316975 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://vuldb.com/?submit.617643 Types: Third Party Advisory, VDB Entry
    Added Reference Type VulDB: https://www.totolink.net/ Types: Product
    Added Reference Type CISA-ADP: https://www.youtube.com/watch?v=XeKu3tfeSME Types: Exploit
    Added Reference Type VulDB: https://www.youtube.com/watch?v=XeKu3tfeSME Types: Exploit
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jul. 22, 2025

    Action Type Old Value New Value
    Added Reference https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md
    Added Reference https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http
    Added Reference https://www.youtube.com/watch?v=XeKu3tfeSME
  • New CVE Received by [email protected]

    Jul. 20, 2025

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
    Added CVSS V2 (AV:N/AC:L/Au:N/C:P/I:P/A:P)
    Added CWE CWE-287
    Added CWE CWE-306
    Added Reference https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md
    Added Reference https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/5.md#poc-http
    Added Reference https://vuldb.com/?ctiid.316975
    Added Reference https://vuldb.com/?id.316975
    Added Reference https://vuldb.com/?submit.617643
    Added Reference https://www.totolink.net/
    Added Reference https://www.youtube.com/watch?v=XeKu3tfeSME
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-7862 is associated with the following CWEs:

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability