CVE-2021-47752 in AWebServer GhostBuilding
Summary
by MITRE • 01/15/2026
AWebServer GhostBuilding 18 contains a denial of service vulnerability that allows remote attackers to overwhelm the server by sending multiple concurrent HTTP requests. Attackers can generate high-volume requests to multiple endpoints including /mysqladmin to potentially crash or render the service unresponsive.
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Analysis
by VulDB Data Team • 01/15/2026
The vulnerability identified as CVE-2021-47752 affects AWebServer GhostBuilding 18, representing a critical denial of service flaw that fundamentally compromises system availability. This vulnerability resides within the web server's request handling mechanisms, specifically targeting its inability to properly manage concurrent HTTP connections. The flaw allows remote attackers to exploit the service by flooding it with multiple simultaneous requests, creating a scenario where legitimate users cannot access the server resources. The attack vector is particularly concerning as it can target multiple endpoints including the sensitive /mysqladmin path, which typically provides administrative access to database management interfaces.
The technical implementation of this vulnerability stems from inadequate resource management and connection handling within the web server's architecture. When multiple concurrent HTTP requests are sent to the server, the system fails to properly throttle or queue these connections, leading to resource exhaustion. The /mysqladmin endpoint becomes a particularly attractive target for attackers as it represents a high-value target for database administrative functions, potentially allowing for more severe impacts beyond simple service disruption. This vulnerability aligns with CWE-400, which categorizes issues related to resource exhaustion and lack of proper resource management in software systems. The flaw demonstrates poor input validation and insufficient connection limiting mechanisms that are essential for maintaining server stability under attack conditions.
The operational impact of CVE-2021-47752 extends beyond simple service disruption, potentially affecting business continuity and data availability. When the server becomes unresponsive due to overwhelming concurrent requests, legitimate users experience complete service denial, which can result in financial losses and reputational damage. The vulnerability is particularly dangerous because it can be exploited with minimal technical expertise, making it an attractive target for automated attack tools. Organizations relying on AWebServer GhostBuilding 18 for critical applications face significant risk as attackers can easily render their services unavailable through this method. The attack can be executed from any remote location, making it difficult to defend against through traditional network perimeter security measures.
Mitigation strategies for this vulnerability should focus on implementing robust rate limiting and connection throttling mechanisms at the network level. Organizations should deploy web application firewalls to monitor and filter excessive requests, particularly targeting the /mysqladmin endpoint which represents a high-risk target. System administrators should configure connection limits and implement proper resource allocation to prevent the server from becoming overwhelmed. The implementation of intrusion detection systems can help identify and block malicious request patterns before they can cause significant damage. Additionally, regular updates and patches should be applied to ensure the web server software is running the latest version that addresses known vulnerabilities. This vulnerability also highlights the importance of following ATT&CK framework guidelines for network service resilience, particularly in mitigating remote denial of service attacks through proper resource management and access controls.