Web Traffic Processing Vulnerability in Libmodsecurity by ModSecurity

CVE-2025-27110

What is CVE-2025-27110?

CVE-2025-27110 is a vulnerability identified in Libmodsecurity, a critical component of the ModSecurity v3 project, which functions as an interface for web traffic processing. The vulnerability pertains to a specific issue in version 3.0.13, where the library fails to decode encoded HTML entities that contain leading zeroes. This failure can allow malicious actors to manipulate web traffic in ways that could compromise security mechanisms, ultimately threatening the integrity and confidentiality of data handled by applications utilizing Libmodsecurity.

Technical Details

The vulnerability resides solely in Libmodsecurity3 version 3.0.13. This bug specifically affects the decoding process of HTML entities that include leading zeroes. As a consequence, any web application relying on this version for its traffic processing may experience flaws in security controls, particularly those related to data sanitization and validation. A fix for this issue was introduced in version 3.0.14, emphasizing the importance of keeping software up to date to mitigate associated risks. There are currently no known workarounds available for this vulnerability.

Potential impact of CVE-2025-27110

1. Web Traffic Manipulation: The main risk posed by this vulnerability is the potential for attackers to manipulate web traffic, leading to a failure in detecting and preventing malicious requests, which could result in compromised web applications.

2. Data Integrity Risks: Organizations may face significant data integrity issues due to the inability to accurately decode incoming web content. This can lead to incorrect data being processed and stored, potentially impacting compliance and trust.

3. Increased Attack Surface: By exploiting CVE-2025-27110, malicious actors could expand their attack surface, enabling further exploitation of systems, including data breaches or additional malicious payload deployment, thereby amplifying the overall security threat landscape for affected organizations.

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References