CVE-2000-0004 is a medium-severity vulnerability affecting ZBServer Pro version 1.5, a web server product developed by zbsoft. The vulnerability allows remote attackers to read the source code of executable files hosted on the server by manipulating the URL to include a dot ('.') character. This dot insertion causes the server to improperly handle the request, exposing the underlying source code of executable scripts or binaries that would normally be inaccessible. The vulnerability does not require authentication and can be exploited remotely over the network with low attack complexity. The impact is limited to confidentiality as attackers can gain access to potentially sensitive source code, but it does not affect integrity or availability. There is no known patch available for this vulnerability, and no public exploits have been reported in the wild. The CVSS v2 base score is 5.0, reflecting a medium severity with network attack vector, no authentication required, and partial confidentiality impact.

For European organizations using ZBServer Pro 1.5, this vulnerability poses a risk of unauthorized disclosure of proprietary or sensitive source code. Exposure of source code can lead to further security risks, such as revealing business logic, credentials, or other sensitive information embedded in the code, which could facilitate subsequent targeted attacks or intellectual property theft. Although the vulnerability does not directly allow code execution or system compromise, the confidentiality breach can undermine trust and compliance with data protection regulations such as GDPR if sensitive information is leaked. Given the age of the product and lack of patches, organizations still running this software are likely operating unsupported legacy systems, increasing their overall risk profile.

Since no official patch is available, European organizations should prioritize the following mitigations: 1) Immediately discontinue use of ZBServer Pro 1.5 and migrate to a modern, supported web server platform with active security maintenance. 2) If migration is not immediately possible, restrict external access to the affected server by implementing strict network segmentation and firewall rules to limit exposure to trusted internal networks only. 3) Employ web application firewalls (WAFs) or intrusion prevention systems (IPS) capable of detecting and blocking suspicious URL patterns, such as those containing dot insertions that could exploit this vulnerability. 4) Conduct thorough code and configuration reviews to ensure no sensitive source code is inadvertently exposed through other means. 5) Monitor server logs for anomalous URL requests indicative of exploitation attempts. 6) Educate IT staff about the risks of legacy software and the importance of timely upgrades.