CVE-2010-20112: Amlib Amlibweb Library Management System

Critical severity, CVSS 9.3. EPSS: 1.6% chance of exploitation in the next 30 days.

Amlib’s NetOpacs webquery.dll contains a stack-based buffer overflow vulnerability triggered by improper handling of HTTP GET parameters. Specifically, the application fails to enforce bounds on input supplied to the app parameter, allowing excessive data to overwrite memory structures including the Structured Exception Handler (SEH). Additionally, malformed parameter names followed by an equals sign may result in unintended control flow behavior. This vulnerability is exposed through IIS and affects legacy Windows deployments

Affected products

• Amlib Amlibweb Library Management System: any version

Published 2025-08-21. Last modified 2026-06-16.