CVE-2026-108930 in NR268
Summary
by MITRE • 10/13/2026
A vulnerability has been found in Netcore NR268 1.7.121109. The impacted element is the function ddns_wan_list_show of the file ddns_wan_list_show.cgi of the component DDNS Handler. The manipulation of the argument user_idN/passwordN leads to information disclosure. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 10/13/2026
The vulnerability identified within Netcore NR268 version 1.7.121109 represents a critical security flaw located specifically within the Dynamic DNS Handler component, more precisely in the ddns_wan_list_show.cgi script and its associated function ddns_wan_list_show. This software is commonly deployed in consumer-grade routers to manage dynamic domain name system updates, allowing devices with changing IP addresses to maintain consistent connectivity. The core technical issue stems from improper input validation and access control mechanisms when processing arguments passed via the user_idN and passwordN parameters. These parameters are intended for authentication or session management but fail to enforce strict boundaries on which data can be retrieved by the requesting entity. Consequently, an attacker who successfully authenticates with valid credentials can manipulate these specific argument structures to trigger a logic error that exposes sensitive internal network information beyond their authorized scope.
This flaw is classified under CWE-200 as Information Exposure and aligns with MITRE ATT&CK technique T1504, which covers Web Session Manipulation or improper handling of session identifiers in web applications. The vulnerability allows for remote exploitation without the need for physical access to the device, significantly lowering the barrier for entry for malicious actors. By crafting specific HTTP requests that exploit the mishandling of user_idN and passwordN fields, an attacker can extract detailed configuration data from the router. This may include internal IP addresses, gateway configurations, connected client MAC addresses, or other network topology details that are not intended to be visible to standard end-users. The disclosure indicates that proof-of-concept exploits have been made public, which increases the likelihood of automated scanning and exploitation by threat actors targeting vulnerable IoT devices on a large scale.
The operational impact of this vulnerability extends beyond simple data leakage. While it does not directly allow for remote code execution or arbitrary command injection in its current form, the information disclosed can serve as critical reconnaissance material for further attacks. Knowledge of internal network structures facilitates lateral movement within local networks, aids in crafting targeted phishing campaigns against specific users based on their device usage patterns, and helps attackers identify other vulnerable services running on adjacent devices. Furthermore, because Netcore has not responded to vendor notifications regarding this disclosure, there is an absence of official patches or firmware updates addressing the issue. This lack of remediation support leaves a vast number of deployed units permanently exposed until users can manually implement workarounds or replace the hardware with more secure alternatives that receive active security maintenance from their manufacturers.
Mitigation strategies for this vulnerability are constrained by the vendor's inactivity, requiring administrators to rely on network-level defenses and configuration hardening. The most effective immediate countermeasure is to restrict access to the router’s administrative interface through firewall rules or VLAN segmentation, ensuring that only trusted management stations can interact with the DDNS handler components. Additionally, changing default credentials and disabling unnecessary services such as UPnP or remote administration features reduces the attack surface available for exploitation. Since the vulnerability relies on authenticated interaction, enforcing strong password policies and enabling two-factor authentication where supported by the firmware can significantly raise the cost of entry for attackers. Long-term resolution requires replacing affected devices with models from vendors who adhere to responsible disclosure practices and provide timely security updates to address such logic flaws in their embedded web interfaces.