Unauthenticated command execution via UDP backdoor
Published Jul 16, 2025 · Updated Apr 7, 2026
Command injection in Netcore Technology and Netis router firmware released before August 2014 allows remote attackers to execute arbitrary commands. An undocumented service on UDP port 53413 accepts the hardcoded string netcore to unlock a command handler, then passes subsequent packet data to the device shell without neutralization. No credentials or user interaction are required; successful exploitation grants privileged router control, although nonstandard echo behavior blocks the published Metasploit payload on some models.
Summary
What happened
Command injection in Netcore Technology and Netis router firmware released before August 2014 allows remote attackers to execute arbitrary commands. An undocumented service on UDP port 53413 accepts the hardcoded string netcore to unlock a command handler, then passes subsequent packet data to the device shell without neutralization. No credentials or user interaction are required; successful exploitation grants privileged router control, although nonstandard echo behavior blocks the published Metasploit payload on some models.
The record
- CVE
- CVE-2025-34117
- Published
- Jul 16, 2025
- Updated
- Apr 7, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-306, CWE-912, CWE-78, CAPEC-88, T1059.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 16, 2025CVE publishedPublication date reported by the CVE source.
- Apr 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Netcore Router UDP 53413 Backdoor Metasploit modulefunctional · demonstrated
- Netcore / Netis Routers UDP Backdoor Accessfunctional · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Reported exploitation
- VulnCheck Known Exploited Vulnerabilities listingknown exploited catalog
Technologies
Your stack
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Your stack
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