CVE-2025-34117
Netcore / Netis Routers RCE via UDP Port 53413 Backdoor
CRITICAL 9.3EPSS 20.8%
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.
- Affected
- Netcore Technology · Netis · Router firmware
- CVSS v4.0 VULNCHECK
- 9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS
- 20.77% chance of exploitation in the next 30 days, 98th percentile
- Published
- 2025-07-16
- Updated
- 2026-04-07
Proof-of-concept exploits (3)
- https://www.exploit-db.com/exploits/43387
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/lin…
- https://vulners.com/metasploit/MSF:EXPLOIT-LINUX-MISC-NETCORE_UDP_53413_BACKDOOR-