CVE-2025-34117

Summary

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 Software

Weaknesses

• CWE-912: CWE-912 Hidden Functionality
• CWE-306: CWE-306 Missing Authentication for Critical Function
• CWE-78: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: total

References

• https://web.archive.org/web/20140828114943/http://blog.trendmicro.com/trendlabs-security-intelligence/netis-routers-leave-wide-open-backdoor/
• https://www.seebug.org/vuldb/ssvid-90227
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/linux/misc/netcore_udp_53413_backdoor.rb
• https://www.shadowserver.org/what-we-do/network-reporting/netcore-netis-router-vulnerability-scan-report/
• https://vulners.com/metasploit/MSF:EXPLOIT-LINUX-MISC-NETCORE_UDP_53413_BACKDOOR-
• https://www.vulncheck.com/advisories/netcore-netis-routers-backdoor-rce
• https://www.exploit-db.com/exploits/43387

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