CVE-2026-100295 in YSSD-RTMP-H5
Summary
by MITRE • 09/29/2026
In Anjvision YSSD‑RTMP‑H5 firmware version 3.3.2.4, an internal debug interface can be enabled through an undocumented pathway, exposing functions not intended for normal operation. When activated, this interface allows actions that could unintentionally provide elevated system access.
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified in Anjvision YSSD-RTMP-H5 firmware version 3.3.2.4 centers on the presence of an undocumented internal debug interface that can be inadvertently or intentionally enabled through non-standard pathways. This architectural flaw represents a significant deviation from secure design principles, as it exposes functionality intended solely for development and maintenance purposes to potential external actors. The existence of such interfaces in production firmware is a common source of severe security risks, particularly when these endpoints are not properly restricted by authentication mechanisms or network segmentation controls. By allowing access to functions that are not meant for normal operation, the system creates an attack surface that bypasses standard operational safeguards, effectively granting users capabilities far beyond their intended privileges within the device ecosystem.
From a technical perspective, this issue aligns with CWE-215, which describes the inclusion of information from debug code in software products. The core flaw lies in the failure to disable or restrict access to these diagnostic tools before deployment. When activated, the interface allows actions that could unintentionally provide elevated system access, potentially leading to full device compromise. This elevation of privilege is particularly dangerous because it may allow an attacker to execute arbitrary commands, modify firmware configurations, or extract sensitive data stored on the device. The lack of proper input validation and authorization checks for this debug pathway means that any entity capable of reaching the interface can interact with low-level system functions, undermining the integrity and confidentiality guarantees expected from embedded IoT devices.
The operational impact of this vulnerability is substantial, as it compromises the fundamental security posture of the YSSD-RTMP-H5 device. Attackers leveraging this flaw could achieve remote code execution or gain administrative control over the hardware without needing valid credentials for standard user interfaces. This capability facilitates a range of malicious activities, including data exfiltration, persistence within the network through backdoor installation, and use of the compromised device as part of a botnet. Furthermore, because debug interfaces often provide access to serial consoles or shell environments, attackers can easily pivot from this initial foothold to attack other systems on the local network, expanding the blast radius significantly beyond the single affected device.
To mitigate these risks, immediate remediation efforts should focus on disabling all non-essential debug interfaces in production firmware builds. Developers must ensure that such features are either completely removed or strictly gated behind robust authentication and authorization mechanisms that are not easily bypassed. Additionally implementing network-level access control lists to restrict connectivity to management ports can provide an additional layer of defense. It is also critical to conduct thorough code reviews focused on identifying any remaining undocumented endpoints or hidden functionality before future releases. Adhering to secure development lifecycle practices, such as those outlined in OWASP IoT Top Ten guidelines regarding insecure default configurations and insufficient access control, will help prevent similar vulnerabilities from being introduced into subsequent firmware versions.