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CVE-2025-51986: Infinite Loop Vulnerability in freemodbus v.2018-09-12

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Overview

The vulnerability CVE-2025-51986 is a critical cybersecurity issue discovered in the demo/LINUXTCP implementation of cwalter-at freemodbus v.2018-09-12. This vulnerability can allow attackers to trigger an infinite loop in the system via a crafted packet length value. The vulnerability primarily affects users or systems utilizing the said freemodbus component and poses a significant risk due to its potential for system compromise and data leakage.

Vulnerability Summary

CVE ID: CVE-2025-51986
Severity: High (7.5 CVSS score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise and data leakage

Affected Products

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Product | Affected Versions

freemodbus | v.2018-09-12

How the Exploit Works

The exploit works by crafting a packet with a specific length value that could trigger an infinite loop in the demo/LINUXTCP implementation of freemodbus. This loop can cause system instability, potentially leading to system compromise or data leakage.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This pseudocode represents a crafted packet with a malicious length value that could trigger the infinite loop.

POST /LINUXTCP/freemodbus HTTP/1.1
Host: target.example.com
Content-Type: application/mbap
{ "transaction_identifier": "1234", "protocol_identifier": "00", "length": "infinite", "unit_identifier": "01" }

Mitigation

To mitigate this vulnerability, users are advised to apply the vendor-provided patch as soon as it’s available. In the meantime, users could employ Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) as temporary mitigation strategies. These tools can help detect and block malicious packets, preventing attackers from 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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