Vulnerability · Published Jul 17, 2025 · Assigned by VulDB

CVE-2025-7758TOTOLINK T6 HTTP POST Request cstecgi.cgi setDiagnosisCfg buffer overflow

High 8.8

In plain English

A high-severity buffer overflow in T6 from TOTOLINK. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 63% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.0%top 37.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability, which was classified as critical, has been found in TOTOLINK T6 up to 4.1.5cu.748_B20211015. Affected by this issue is the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi of the component HTTP POST Request Handler. The manipulation of the argument ip leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used.

Affected products (as reported)

Vendor	Product	Versions
TOTOLINK	T6	4.1.5cu.748_B20211015

Weakness: CWE-120, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-316748 | TOTOLINK T6 HTTP POST Request cstecgi.cgi setDiagnosisCfg buffer overflow vdb-entry, technical-description
VDB-316748 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #615734 | TOTOLINK T6 V4.1.5cu.748_B20211015 Buffer Overflow third-party-advisory
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/3.md related
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/3.md#poc exploit
https://www.totolink.net/ product