CVE-2025-34117: critical vulnerability in Netcore Technology Router firmware
Netcore / Netis Routers RCE via UDP Port 53413 Backdoor
Published · Updated
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90Vexday Risk Score
Patch now. It exploitation observed by VulnCheck and has a working public exploit.
ssvc Actcvss 9.3epss 21%
from disclosure to weaponsame day
Published on NVDJul 16
metasploitAug 25
VulnCheck+238d
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.
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
public PoCs found — 3
cve_referenceraw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/misc/netcore_udp_53413_backdoor.rbunverifiedcve_referencevulners.com/metasploit/MSF:EXPLOIT-LINUX-MISC-NETCORE_UDP_53413_BACKDOOR-unverifiedcve_referencewww.exploit-db.com/exploits/43387unverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/misc/netcore_udp_53413_backdoor.rbhttps://vulners.com/metasploit/MSF:EXPLOIT-LINUX-MISC-NETCORE_UDP_53413_BACKDOOR-https://web.archive.org/web/20140828114943/http://blog.trendmicro.com/trendlabs-security-intelligence/netis-routers-leave-wide-open-backdoor/https://www.exploit-db.com/exploits/43387https://www.seebug.org/vuldb/ssvid-90227https://www.shadowserver.org/what-we-do/network-reporting/netcore-netis-router-vulnerability-scan-report/https://www.vulncheck.com/advisories/netcore-netis-routers-backdoor-rce