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CVE-2025-1991: Denial of Service Vulnerability in IBM Informix Dynamic Server

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Overview

The cybersecurity landscape is constantly under threat from new vulnerabilities. One such critical vulnerability, CVE-2025-1991, affects IBM’s Informix Dynamic Server versions 12.10, 14.10, and 15.0. This vulnerability could potentially allow a remote attacker to cause a denial of service (DoS) in the affected systems, leading to potential system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2025-1991
Severity: High – CVSS:7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: The vulnerability could allow an attacker to cause a denial of service, potentially compromising the system or leading to data leakage.

Affected Products

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Product | Affected Versions

IBM Informix Dynamic Server | 12.10
IBM Informix Dynamic Server | 14.10
IBM Informix Dynamic Server | 15.0

How the Exploit Works

The vulnerability lies in the processing packets of the IBM Informix Dynamic Server. An integer underflow error when processing packets allows for a remote attacker to send specifically crafted packets to the server, disrupting its normal functioning and causing a denial of service. This could potentially lead to unauthorized access to sensitive information or even system compromise.

Conceptual Example Code

This is a theoretical example of how an attacker might exploit the vulnerability using a crafted packet.

POST /process_packet HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"packet": {
"size": -1,
"content": "malicious_content"
}
}

In this example, the packet size is set to -1, potentially triggering the integer underflow error in the server’s packet processing function.

Mitigation Guidance

Users are advised to apply the vendor-provided patch to fix this vulnerability as soon as it becomes available. In the meantime, implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation against potential attacks exploiting this vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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