CVE-2023-27806 in Magic R100
Summary
by MITRE • 04/07/2023
H3C Magic R100 R100V100R005.bin was discovered to contain a stack overflow via the ipqos_lanip_dellist 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-2023-27806 affects the H3C Magic R100 router firmware version R100V100R005, specifically within the ipqos_lanip_dellist interface located at the /goform/aspForm endpoint. This represents a critical stack overflow vulnerability that resides in the web-based administration interface of the device, making it particularly dangerous as it can be exploited through network-based attacks without requiring physical access or authentication. The flaw manifests when processing requests to the designated endpoint, where improper input validation allows malicious actors to manipulate memory allocation patterns that ultimately lead to stack corruption.
The technical implementation of this vulnerability stems from inadequate bounds checking and buffer management within the firmware's handling of user-supplied data. When the ipqos_lanip_dellist interface processes incoming requests through the /goform/aspForm path, it fails to properly validate the length and content of parameters passed to the function, creating an exploitable condition where stack-based buffer overflow occurs. This type of vulnerability falls under CWE-121 Stack-based Buffer Overflow, which is classified as a fundamental memory safety issue that allows attackers to overwrite adjacent memory locations including return addresses and function pointers. The attack vector is particularly concerning as it operates over HTTP protocols, making it accessible to remote adversaries who can craft malicious payloads through web forms or API endpoints.
From an operational impact perspective, this vulnerability enables attackers to execute Denial of Service attacks against the affected H3C Magic R100 devices, potentially rendering them completely non-functional and disrupting network services for legitimate users. The DoS condition can be triggered by sending a specially crafted payload to the vulnerable endpoint, which may cause the router to crash, reboot unexpectedly, or become unresponsive to legitimate network traffic. This disruption can have cascading effects on network infrastructure, particularly in environments where these devices serve as primary network gateways or traffic controllers. The vulnerability's accessibility through standard web protocols means that exploitation can occur from any location with network connectivity to the device, without requiring specialized tools or deep technical knowledge of the underlying system architecture.
The attack surface for this vulnerability aligns with the MITRE ATT&CK framework under the T1210 Compromise Software Supply Chain and T1499 Endpoint Denial of Service tactics, as it enables adversaries to compromise network infrastructure through software-based exploitation. Network administrators should consider this vulnerability as part of their broader security posture assessment, particularly in environments where legacy network devices are still deployed and maintained. The impact extends beyond simple service disruption as it may provide attackers with opportunities to establish persistent access points within network environments, especially if the device serves as a gateway for other sensitive systems. Organizations should implement immediate mitigation strategies including firmware updates from H3C, network segmentation to isolate affected devices, and monitoring for suspicious traffic patterns that may indicate exploitation attempts. Additionally, this vulnerability highlights the importance of regular firmware updates and security assessments for network infrastructure devices, as many organizations continue to operate outdated equipment that may contain unpatched security flaws.