CVE-2025-7862: TOTOLINK T6 Telnet Service cstecgi.cgi setTelnetCfg missing authentication
A vulnerability has been found in TOTOLINK T6 4.1.5cu.748B20211015 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 telnetenabled 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Set telnet_enabled to 0 (disable Telnet) to prevent the missing authentication condition triggered by manipulation of the telnet_enabled argument with input 1.
TOTOLINK T6 Telnet Service (cgi-bin/cstecgi.cgi setTelnetCfg) telnet_enabled = 0 - Compensating control
Restrict remote access to the Telnet Service (cstecgi.cgi /cgi-bin/cstecgi.cgi) at the network/ACL level until the issue is remediated, since the attack can be launched remotely.
Event History
Frequently Asked Questions
What is the severity of CVE-2025-7862?
CVE-2025-7862 is classified as a critical vulnerability.
What component is affected by CVE-2025-7862?
CVE-2025-7862 affects the Telnet Service in the TOTOLINK T6 device.
How do I fix CVE-2025-7862?
To fix CVE-2025-7862, disable the Telnet service in the device settings.
What function is exploited in CVE-2025-7862?
CVE-2025-7862 exploits the function setTelnetCfg in the cgi-bin/cstecgi.cgi file.
Which devices are affected by CVE-2025-7862?
CVE-2025-7862 affects the TOTOLINK T6 version 4.1.5cu.748_B20211015.