CVE-2011-4871

Exp

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.

Published: 2012-04-18 Last update: 2026-04-29 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2011-4871 is rated High Exploit Risk (64.5/100): CVSS Medium severity, with high exploitation likelihood (EPSS 12.10%, 94th percentile). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2011-4871

EDB-ID Source Kind Published Link
17965 exploit_db edb 2011-10-10 Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2011-4871

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-24 15.48% 12.10% -3.39%
2 2026-04-27 11.23% 15.48% +4.26%
3 2026-03-10 — 11.23% —

Full EPSS history (20 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2011-4871

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2011-4871

Affected software / configurations for CVE-2011-4871

Vendor Product Version Raw CPE
opcsystems opcsystems.net <= 4.0 cpe:2.3:a:opcsystems:opcsystems.net:*:*:*:*:*:*:*:*

References for CVE-2011-4871

cvelogic Threat Intelligence