CVE-2019-25322 in Netmonitor
Summary
by MITRE • 02/13/2026
Heatmiser Netmonitor 3.03 contains a hardcoded credentials vulnerability in the networkSetup.htm page with predictable admin login credentials. Attackers can access the device by using the hard-coded username 'admin' and password 'admin' in the hidden form input fields.
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Analysis
by VulDB Data Team • 02/13/2026
The vulnerability identified as CVE-2019-25322 represents a critical security flaw in Heatmiser Netmonitor version 3.03, specifically within the networkSetup.htm web interface component. This issue manifests as a hardcoded credentials vulnerability that exposes administrative access to unauthorized parties through predictable login credentials. The vulnerability exists in the web-based configuration interface of the heating control device, which is commonly deployed in commercial and residential environments for temperature regulation and monitoring purposes. The presence of hard-coded administrative credentials in the hidden form input fields creates a persistent security weakness that undermines the device's authentication mechanism and provides direct pathways for unauthorized access.
The technical implementation of this vulnerability stems from the developers embedding default administrative credentials directly into the web page source code rather than implementing dynamic credential generation or secure authentication mechanisms. The hardcoded credentials consist of a username 'admin' and password 'admin' which are stored in hidden HTML form fields within the networkSetup.htm page. This approach violates fundamental security principles and creates a known attack vector that requires no advanced exploitation techniques. The vulnerability falls under CWE-798, which specifically addresses the use of hard-coded credentials in software applications, making it particularly dangerous as it eliminates the need for reconnaissance or credential guessing phases of an attack. The predictable nature of these credentials means that any attacker with access to the device's network interface or web portal can immediately gain administrative privileges without requiring additional exploitation methods.
The operational impact of this vulnerability extends beyond simple unauthorized access to encompass potential compromise of entire heating control systems within buildings. Attackers who successfully exploit this vulnerability can modify heating schedules, adjust temperature settings, disable security features, or even gain access to other connected systems through the compromised device. In commercial environments, this could lead to significant energy waste, operational disruption, or unauthorized modification of critical temperature controls. The vulnerability also creates potential for lateral movement within network environments, as the compromised device may serve as a foothold for attackers to explore and compromise other connected systems. From an ATT&CK framework perspective, this vulnerability maps to T1078 which covers valid accounts and T1087 which covers account discovery, as attackers can leverage the hardcoded credentials to establish persistent access and enumerate system resources.
Mitigation strategies for CVE-2019-25322 should prioritize immediate remediation through firmware updates provided by Heatmiser, as the vendor would have likely released patches addressing this specific vulnerability. Organizations should also implement network segmentation to isolate these devices from critical infrastructure and limit their access to essential services only. Network monitoring should be enhanced to detect unauthorized access attempts and unusual administrative activities on these devices. Security assessments should include verification of default credential usage across all networked devices, with particular attention to industrial control systems and IoT devices that may contain similar hardcoded credentials. Additionally, implementing network access controls and restricting web interface access to authorized personnel only can significantly reduce the attack surface. The vulnerability highlights the importance of secure development practices and proper credential management in embedded systems, emphasizing that default credentials should never be hardcoded into production software and that all authentication mechanisms should be robust against predictable credential attacks.