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Vulnerability record · CVE-2011-4871 · published 18 April 2012

CVE-2011-4871: Opcsystems.net improper input validation vulnerability

Opcsystems · Opcsystems.Net

Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.

5.0 CVSS 2.0 Medium EPSS 3.1% · top 12.7% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
3.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References
16 Jun 2026Last modified by NVD

Description

Open Automation Software OPC Systems.NET before 5.0 allows remote attackers to cause a denial of service via a malformed .NET RPC packet on TCP port 58723.

AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf US Government Resource
http://www.us-cert.gov/control_systems/pdf/ICSA-12-012-01.pdf US Government Resource

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2011-4871), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.