CVE-2000-0394 in NetProwler
Summary
by MITRE
NetProwler 3.0 allows remote attackers to cause a denial of service by sending malformed IP packets that trigger NetProwler's Man-in-the-Middle signature.
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Analysis
by VulDB Data Team • 04/21/2026
The vulnerability identified as CVE-2000-0394 affects NetProwler 3.0, a network security tool designed for network monitoring and analysis. This flaw represents a critical denial of service weakness that can be exploited by remote attackers to disrupt the normal operation of the targeted system. The vulnerability specifically manifests when the software encounters malformed IP packets that are crafted to trigger the Man-in-the-Middle signature detection mechanism within NetProwler's architecture.
The technical implementation of this vulnerability stems from inadequate input validation within the network packet processing routines of NetProwler 3.0. When the system receives specially crafted malformed IP packets, the signature matching algorithm fails to properly handle the unexpected packet structures, leading to system instability and eventual service disruption. This weakness falls under the category of improper input validation as classified by CWE-20, where the software does not adequately validate or sanitize incoming network data before processing it through its signature detection mechanisms. The flaw is particularly dangerous because it can be exploited remotely without requiring authentication or privileged access, making it an attractive target for malicious actors seeking to disrupt network operations.
The operational impact of this vulnerability extends beyond simple service interruption, as it can potentially lead to complete system unavailability and network monitoring failures. Organizations relying on NetProwler 3.0 for network security monitoring would face significant operational challenges when this vulnerability is exploited, as the denial of service would prevent the system from performing its intended security functions. The attack vector through malformed IP packets aligns with techniques commonly associated with network-level attacks and can be classified under the ATT&CK framework's T1498 - Network Denial of Service category, which specifically addresses methods for disrupting network services through various network-based attacks.
Mitigation strategies for this vulnerability should focus on implementing robust input validation mechanisms and network segmentation to limit the exposure of vulnerable systems. Organizations should consider upgrading to patched versions of NetProwler or implementing network filters to drop suspicious malformed packets before they reach the vulnerable system. The vulnerability also highlights the importance of proper error handling in security tools, as the system should gracefully handle malformed inputs rather than crashing or becoming unresponsive. Additionally, network administrators should implement monitoring solutions to detect unusual traffic patterns that might indicate exploitation attempts, and establish incident response procedures to quickly address any denial of service events. The remediation process should include thorough testing of updated software versions to ensure that the patched implementation properly handles malformed packets without introducing new vulnerabilities.