CVE-2010-20112

Amlibweb NetOpacs webquery.dll Stack Buffer Overflow

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

Amlib · Amlibweb Library Management System

CVSS v4.0 VULNCHECK

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

1.61% chance of exploitation in the next 30 days, 76th percentile

Published

2025-08-21

Updated

2026-04-07

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/16793
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/win…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/windows/http/amlibweb_webquerydl…

References

• CVE Record
• NVD entry