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Vulnerability record · CVE-2025-34117 · published 16 July 2025

CVE-2025-34117: OS command injection vulnerability

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.

9.3 CVSS 4.0 Critical EPSS 27% · top 2.0% CWE-78 · OS command injectionCWE-306 · Missing authentication for critical function Deferred
9.3CVSS 4.0 base score
27%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

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:

References

LinkTags
https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/misc/netcore_udp_53413_backd
https://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-leav
https://www.exploit-db.com/exploits/43387
https://www.seebug.org/vuldb/ssvid-90227
https://www.shadowserver.org/what-we-do/network-reporting/netcore-netis-router-vulnerability-scan-report/
https://www.vulncheck.com/advisories/netcore-netis-routers-backdoor-rce

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Source: NIST National Vulnerability Database (record CVE-2025-34117), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.