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.
Question to Ask Vendors:
- Can you confirm whether your systems are affected by CVE-2025-34117, and if so, what steps are you currently taking to mitigate this vulnerability?
- What is your estimated timeline for fully resolving CVE-2025-34117 in your products or services, and how will you communicate updates on this issue to us as your customer?
Recommended Actions:
- Check out the advisory links provided below.
References:
- http://webappsec.pbworks.com/OS-Commanding
- https://capec.mitre.org/data/definitions/108.html
- https://capec.mitre.org/data/definitions/15.html
- https://capec.mitre.org/data/definitions/43.html
- https://capec.mitre.org/data/definitions/6.html
- https://capec.mitre.org/data/definitions/88.html
- https://nvd.nist.gov/vuln/detail/CVE-2025-34117