Vulnerability · Published Jul 25, 2025 · Assigned by VulDB

CVE-2025-8170TOTOLINK T6 MQTT Packet meshSlaveDlfw tcpcheck_net 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 1.3% (higher than 71% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)1.3%top 29.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability classified as critical was found in TOTOLINK T6 4.1.5cu.748_B20211015. This vulnerability affects the function tcpcheck_net of the file /router/meshSlaveDlfw of the component MQTT Packet Handler. The manipulation of the argument serverIp leads to buffer overflow. The attack can be initiated 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-317584 | TOTOLINK T6 MQTT Packet meshSlaveDlfw tcpcheck_net buffer overflow vdb-entry, technical-description
VDB-317584 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #620834 | TOTOLINK T6 V4.1.5cu.748_B20211015 Buffer Overflow third-party-advisory
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/9.md related
https://github.com/AnduinBrian/Public/blob/main/Totolink%20T6/Vuln/9.md#poc exploit
https://www.totolink.net/ product