What’s Vulnerable › Vulnerabilities

CVE-2010-20112: Amlibweb NetOpacs webquery.dll Stack Buffer Overflow

• Severity: critical (CVSS 9.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-21 · updated 2026-06-16
• Weakness: CWE-121

Description

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

• Amlibweb Library Management System: all versions

References

• https://advisories.checkpoint.com/defense/advisories/public/2013/cpai-2013-1344.html
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/amlibweb_webquerydll_app.rb
• https://www.amlib.co.uk/product/product.aspx?menuId=top_products
• https://www.exploit-db.com/exploits/16793
• https://www.fortiguard.com/encyclopedia/ips/24002
• https://www.vulncheck.com/advisories/amlibweb-netopacs-stack-buffer-overflow
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/amlibweb_webquerydll_app.rb
• https://www.exploit-db.com/exploits/16793

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