CVE-2010-20112Public exploitNetwork attack vector

Unauthenticated code execution via oversized app parameter

Published Aug 21, 2025 · Updated Apr 7, 2026

Stack-based buffer overflow in OCLC Amlib NetOpacs allows remote attackers to execute arbitrary code via a crafted HTTP GET request. webquery.dll accepts an oversized app parameter without enforcing bounds, overwriting the stack and Structured Exception Handler; a parameter name ending in an equals sign can also redirect EIP. No authentication or user interaction is required; successful exploitation runs code in the IIS-hosted process context on legacy Windows deployments.

CVSS severity9.3
Critical
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in OCLC Amlib NetOpacs allows remote attackers to execute arbitrary code via a crafted HTTP GET request. webquery.dll accepts an oversized app parameter without enforcing bounds, overwriting the stack and Structured Exception Handler; a parameter name ending in an equals sign can also redirect EIP. No authentication or user interaction is required; successful exploitation runs code in the IIS-hosted process context on legacy Windows deployments.

The record

CVE
CVE-2010-20112
Published
Aug 21, 2025
Updated
Apr 7, 2026
Vendor
OCLC
Product
Amlib
Classifications
CWE-121, CAPEC-100, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OCLC · Amlibversion=*

Published CVSS scores

9.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CAPEC-100Overflow Buffers
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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