CVE-1999-1523 in Web Server
Summary
by MITRE
Buffer overflow in Sambar Web Server 4.2.1 allows remote attackers to cause a denial of service, and possibly execute arbitrary commands, via a long HTTP GET request.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability identified as CVE-1999-1523 represents a critical buffer overflow flaw within the Sambar Web Server version 4.2.1 that exposes systems to remote exploitation. This issue stems from inadequate input validation mechanisms within the server's handling of HTTP GET requests, creating a pathway for malicious actors to manipulate memory structures through crafted payload sequences. The vulnerability specifically targets the server's ability to process lengthy request parameters, where the application fails to properly bounds-check incoming data before copying it into fixed-length buffers, leading to memory corruption that can result in unpredictable behavior.
The technical exploitation of this buffer overflow vulnerability occurs when an attacker submits an HTTP GET request containing excessive data that exceeds the allocated buffer space within the Sambar Web Server's memory management. This overflow can overwrite adjacent memory locations, potentially corrupting critical program execution structures such as return addresses, function pointers, or other control data. According to CWE standards, this corresponds to CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflows. The vulnerability's classification aligns with the ATT&CK framework's technique T1203, which involves exploiting software vulnerabilities to gain unauthorized access or execute malicious code.
The operational impact of CVE-1999-1523 extends beyond simple denial of service conditions to encompass potential remote code execution capabilities that could allow attackers to completely compromise affected systems. When successfully exploited, the buffer overflow can cause the web server process to crash and restart, resulting in denial of service for legitimate users, or more severely, enable attackers to inject and execute arbitrary commands on the host system. This represents a significant threat to system integrity and availability, as the vulnerability can be exploited without authentication requirements, making it particularly dangerous in publicly accessible web environments. The affected Sambar Web Server version 4.2.1 was widely deployed in enterprise and organizational settings, amplifying the potential impact of this vulnerability across multiple security domains.
Mitigation strategies for CVE-1999-1523 primarily focus on immediate remediation through software updates and patches provided by the vendor, as well as network-level defensive measures. Organizations should prioritize upgrading to patched versions of the Sambar Web Server or migrating to more modern web server solutions that have better memory management and input validation practices. Network administrators can implement rate limiting and request size restrictions at perimeter devices to limit the effectiveness of exploitation attempts. Additionally, security monitoring should be enhanced to detect unusual patterns in HTTP GET request lengths that might indicate attempted exploitation. The vulnerability serves as a historical example of how inadequate input validation and memory safety practices can create persistent security risks, emphasizing the importance of secure coding practices and regular vulnerability assessments. According to industry best practices, this vulnerability demonstrates the necessity of implementing comprehensive software security testing including fuzzing and memory safety analysis to identify and remediate similar buffer overflow conditions in web server implementations.