Executive Summary

CVE-2025-13826 is a high-severity vulnerability in the Zervit portable HTTP/web server caused by improper validation of user-supplied input related to configuration reset requests.

An attacker can exploit this vulnerability by sending specially crafted malicious requests that cause the server application to stop responding, resulting in a remote Denial of Service (DoS) condition.

The vulnerability does not require any privileges, user interaction, or client-side complexity to exploit, and the affected application can be manually restarted after exploitation.

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Mitigation Strategies

To mitigate this vulnerability, you should monitor the Zervit portable HTTP/web server for any signs of service disruption caused by malicious configuration reset requests.

If the application stops responding due to exploitation, a manual restart of the application is possible and should be performed promptly to restore service.

Since no patch or solution is currently available, it is important to restrict access to the server to trusted users and networks to reduce the risk of exploitation.

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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Impact Analysis

If exploited, this vulnerability can cause the Zervit portable HTTP/web server to stop responding, leading to a Denial of Service (DoS) condition.

This means that legitimate users will be unable to access the services provided by the server until it is manually restarted.

Such service disruption can affect availability and reliability of applications relying on this server.

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Detection Guidance

This vulnerability can be detected by monitoring for malicious configuration reset requests sent to the Zervit portable HTTP/web server. Since the vulnerability is triggered by specially crafted input causing the server to stop responding, detection involves identifying unusual or malformed reset requests targeting the server.

Specific commands are not provided in the available resources. However, network administrators can use packet capture tools like tcpdump or Wireshark to filter HTTP requests to the server and look for suspicious reset requests. For example, a tcpdump command to capture HTTP traffic to the server might be:

• tcpdump -i <interface> tcp port 80 and host <server_ip>

Analyzing captured traffic for unusual or malformed configuration reset requests could help detect exploitation attempts. Additionally, monitoring the server's responsiveness and logs for unexpected crashes or stops can indicate an attack.

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