CVE-2025-34117 Netcore / Netis Routers RCE via UDP Port 53413 Backdoor
Unauthenticated attackers can execute arbitrary commands on Netcore and Netis routers via a backdoor UDP listener, requiring firmware updates to mitigate.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-34117?
CVE-2025-34117 is a critical command injection vulnerability in Netcore Technology Router firmware, published on 16 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A remote code execution vulnerability exists in multiple Netcore and Netis routers models with firmware released prior to August 2014 due to the presence of an undocumented backdoor listener on UDP port 53413. Exact version boundaries remain undocumented. An unauthenticated remote attacker can send specially crafted UDP packets to execute arbitrary commands on the affected device. This backdoor uses a hardcoded authentication mechanism and accepts shell commands post-authentication. Some device models include a non-standard implementation of the `echo` command, which may affect exploitability.
Which versions are affected by CVE-2025-34117?
How do I fix CVE-2025-34117?
No fix has been published for CVE-2025-34117 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2025-34117 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34117 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-86xp-hg9p-72mv.