CVE-2023-27803 in Magic R100
Summary
by MITRE • 04/07/2023
H3C Magic R100 R100V100R005.bin was discovered to contain a stack overflow via the EdittriggerList interface at /goform/aspForm. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted payload.
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Analysis
by VulDB Data Team • 11/25/2025
The vulnerability identified as CVE-2023-27803 affects the H3C Magic R100 router firmware version R100V100R005, specifically within the web interface management component. This issue manifests through the EdittriggerList interface located at the /goform/aspForm endpoint, representing a critical security flaw that exposes the device to potential exploitation. The vulnerability stems from improper input validation and memory handling within the firmware's web form processing logic, creating a condition where maliciously crafted payloads can trigger unexpected behavior in the device's operation.
The technical flaw constitutes a stack overflow vulnerability that occurs when the EdittriggerList interface processes user-supplied data without adequate bounds checking or sanitization. When an attacker submits a specially crafted payload to this endpoint, the system fails to properly validate the input length and structure, allowing the malicious data to exceed the allocated stack buffer space. This overflow condition can corrupt adjacent memory locations, potentially leading to arbitrary code execution or system instability. The vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which describes a condition where data written to a stack buffer exceeds the buffer's capacity, causing adjacent memory to be overwritten.
The operational impact of this vulnerability extends beyond simple denial of service, as it represents a potential gateway for more sophisticated attacks within network infrastructure. An attacker who successfully exploits this vulnerability could cause the router to crash repeatedly, resulting in network disruption for all connected devices. The DoS condition may be persistent, requiring manual intervention or firmware reinstallation to restore normal operation. This type of vulnerability is particularly concerning in enterprise environments where network reliability is critical, as it can be leveraged to create service interruptions that may go unnoticed for extended periods. The attack surface is limited to authenticated or unauthenticated access to the web management interface, making it potentially exploitable by remote attackers who can discover the vulnerable endpoint through reconnaissance activities.
Mitigation strategies for this vulnerability should prioritize immediate firmware updates from H3C to address the underlying stack overflow condition. Network administrators should implement strict access controls limiting management interface access to trusted networks and IP addresses, reducing the attack surface available to potential exploiters. The implementation of network monitoring solutions capable of detecting anomalous traffic patterns or repeated connection attempts to the vulnerable endpoint can provide early warning of exploitation attempts. Additionally, organizations should consider disabling unnecessary web management interfaces and implementing web application firewalls to filter malicious payloads before they reach the vulnerable system components. This vulnerability demonstrates the importance of secure coding practices and proper input validation, particularly in embedded systems where resource constraints may lead to inadequate security measures. The ATT&CK framework categorizes this type of vulnerability under T1210 Exploitation of Remote Services, as it represents an attack vector that leverages weaknesses in network service implementations. Organizations should also conduct regular vulnerability assessments of their network infrastructure to identify similar flaws in other devices and firmware versions that may present analogous security risks.