CVE-2023-27064 in W15EV1
Summary
by MITRE • 03/13/2023
Tenda V15V1.0 V15.11.0.14(1521_3190_1058) was discovered to contain a buffer overflow vulnerability via the index parameter in the formDelDnsForward function. This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted request.
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Analysis
by VulDB Data Team • 11/14/2025
The vulnerability identified as CVE-2023-27064 represents a critical buffer overflow flaw within the Tenda V15V1.0 V15.11.0.14(1521_3190_1058) firmware version, specifically manifesting in the formDelDnsForward function. This issue arises from inadequate input validation mechanisms that fail to properly handle excessive data within the index parameter, creating a condition where memory boundaries are exceeded during processing. The affected device operates under the Tenda product line, which is widely deployed in consumer and small office networking environments, making this vulnerability particularly concerning due to its potential for widespread exploitation. The buffer overflow occurs when the system processes a maliciously crafted request containing an oversized index parameter, leading to unpredictable memory corruption that can compromise the device's stability and operational integrity.
The technical exploitation of this vulnerability enables attackers to trigger a denial of service condition by sending specifically crafted HTTP requests to the affected device's web interface. When the formDelDnsForward function processes the malformed index parameter, it fails to validate the input length against allocated buffer space, causing a stack-based buffer overflow scenario. This type of vulnerability falls under CWE-121, which classifies stack-based buffer overflow conditions, and represents a classic example of insufficient input validation in web application components. The attack vector leverages the device's web management interface, where the vulnerable parameter is processed without adequate bounds checking, allowing an attacker to manipulate memory layout and potentially execute arbitrary code or cause system crashes. The vulnerability's impact is amplified by the fact that it requires minimal privileges to exploit, as the device's web interface is typically accessible to unauthenticated users.
The operational consequences of this vulnerability extend beyond simple service disruption, as it can render the affected network device completely inaccessible to legitimate users while potentially providing attackers with opportunities for further exploitation. Network administrators may experience complete loss of device management capabilities, forcing them to physically access the device to restore functionality through recovery procedures. The DoS condition can persist until the device is manually rebooted or the firmware is updated, creating significant operational downtime for affected networks. This vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and represents a critical weakness in the device's defensive posture against malicious actors who seek to disrupt network services. The widespread deployment of Tenda devices in residential and small business environments means that numerous networks could be simultaneously compromised, potentially leading to cascading effects in larger network infrastructures.
Mitigation strategies for CVE-2023-27064 should prioritize immediate firmware updates from Tenda, as the vendor has likely released patches addressing this specific buffer overflow condition. Network administrators should implement network segmentation to limit access to affected devices and monitor for suspicious traffic patterns that may indicate exploitation attempts. The vulnerability highlights the importance of robust input validation mechanisms and proper buffer management in embedded web applications, emphasizing the need for regular security assessments of network infrastructure devices. Organizations should also consider implementing intrusion detection systems that can identify and block malformed requests targeting web interfaces, particularly those containing unusually long parameter values. Additionally, network monitoring tools should be configured to alert on DoS attack patterns, as the exploitation of this vulnerability typically manifests as sustained traffic patterns that can be detected through proper network analysis. The incident underscores the critical need for manufacturers to implement comprehensive security testing procedures during development cycles to identify and remediate buffer overflow vulnerabilities before deployment.