Netcore/Netis Router up to 2014 UDP backdoor

CVSS Meta Temp Score
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CTI Interest Score
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8.6$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Netcore/Netis Router up to 2014. Affected by this vulnerability is an unknown functionality of the component UDP Handler. This manipulation causes backdoor. This vulnerability appears as CVE-2025-34117. The attack may be initiated remotely. In addition, an exploit is available. It is advisable to implement restrictive firewalling.

Detailsinfo

A vulnerability has been found in Netcore/Netis Router up to 2014 and classified as critical. Affected by this vulnerability is an unknown functionality of the component UDP Handler. The manipulation with an unknown input leads to a backdoor vulnerability. The CWE definition for the vulnerability is CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The weakness was presented by Trend Micro Trendlabs. It is possible to read the advisory at web.archive.org. This vulnerability is known as CVE-2025-34117 since 04/15/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1588.001 according to MITRE ATT&CK.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

Proper firewalling of is able to address this issue.

The vulnerability is also documented in the databases at Exploit-DB (43387) and EUVD (EUVD-2025-21753). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 8.6

VulDB Base Score: 9.8
VulDB Temp Score: 8.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Backdoor
CWE: CWE-912
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/15/2025 🔍
07/17/2025 +93 days 🔍
07/17/2025 +0 days 🔍
07/18/2025 +0 days 🔍

Sourcesinfo

Advisory: web.archive.org
Researcher: Trend Micro Trendlabs
Status: Not defined

CVE: CVE-2025-34117 (🔍)
GCVE (CVE): GCVE-0-2025-34117
GCVE (VulDB): GCVE-100-316723
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 07/17/2025 04:20
Updated: 07/18/2025 01:14
Changes: 07/17/2025 04:20 (72), 07/18/2025 01:14 (1)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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