CVE-2025-8170 TOTOLINK T6 MQTT Packet meshSlaveDlfw tcpcheck_net buffer overflow
Remote attackers can trigger a buffer overflow in the MQTT packet handler of TOTOLINK T6 routers, potentially leading to code execution or service disruption.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-8170?
CVE-2025-8170 is a high-severity memory corruption vulnerability in TOTOLINK T6, published on 25 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Which versions are affected by CVE-2025-8170?
It affects 1 product.
Products include Totolink T6 Firmware.
How do I fix CVE-2025-8170?
No fix has been published for CVE-2025-8170 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-8170 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-8170 exists.
Other vulnerabilities in TOTOLINK T6
Sources
Also known as GHSA-h7jx-x34c-vc7c.