CVE-2000-0140 in Internet Anywhere Mail Server
Summary
by MITRE
Internet Anywhere POP3 Mail Server allows remote attackers to cause a denial of service via a large number of connections.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 10/19/2025
The vulnerability described in CVE-2000-0140 affects the Internet Anywhere POP3 Mail Server implementation, representing a classic denial of service attack vector that exploits connection handling weaknesses in network services. This vulnerability falls under the broader category of resource exhaustion attacks where malicious actors can overwhelm the target system by establishing numerous concurrent connections, ultimately leading to service disruption. The flaw demonstrates a fundamental weakness in the server's ability to manage and limit incoming connection requests, creating a scenario where legitimate users cannot access the mail service due to resource exhaustion.
This vulnerability represents a specific implementation flaw in how the POP3 server processes incoming connection requests without adequate rate limiting or connection management mechanisms. The technical nature of the issue stems from the server's inability to properly handle a large volume of simultaneous connection attempts, which can be exploited through automated tools or scripts that rapidly establish connections. The lack of proper connection throttling or limiting mechanisms allows attackers to consume available system resources such as memory, file descriptors, or process slots, effectively rendering the service unavailable to legitimate users. This type of vulnerability aligns with CWE-400 which categorizes resource exhaustion issues and demonstrates poor input validation and resource management practices in network service implementations.
The operational impact of this vulnerability extends beyond simple service disruption to potentially affect business continuity and user productivity in environments where email services are critical. Organizations relying on the Internet Anywhere POP3 Mail Server could experience complete email service outages during an attack, affecting communication workflows and potentially causing significant operational delays. The vulnerability is particularly concerning because it can be exploited by attackers with minimal technical expertise, as the attack vector involves simply creating multiple connections rather than complex exploitation techniques. This makes it a preferred target for low-skilled attackers seeking to disrupt services, and the impact can be amplified in environments where email is a primary communication channel.
Mitigation strategies for this vulnerability should focus on implementing connection rate limiting, establishing maximum connection thresholds, and deploying network-level protections such as firewalls or intrusion prevention systems to monitor and restrict excessive connection attempts. System administrators should configure the server to limit concurrent connections and implement proper logging to detect unusual connection patterns that may indicate an attack. The implementation of connection pooling, timeout mechanisms, and proper resource allocation can help prevent the server from being overwhelmed by excessive connection requests. Additionally, organizations should consider deploying network segmentation and access control measures to limit exposure to external attack vectors. This vulnerability highlights the importance of implementing defense-in-depth strategies and proper network service hardening practices that align with security frameworks such as the NIST Cybersecurity Framework and the MITRE ATT&CK matrix, specifically addressing the privilege escalation and denial of service techniques that attackers might employ to exploit such weaknesses.