Vulnerability Note VU#496040

Sielco Sistemi Winlog server stack overflow

Original Release date: 03 Feb 2011 | Last revised: 03 Feb 2011


Sielco Sistemi Winlog TCP/IP server contains a stack overflow vulnerability


According to Sielco Sistemi's website: "Winlog is a software package for SCADA/HMI applications with web support, OPC client and a wide library of communication drivers and protocols for most PLCs (Siemens, Omron, Allen Bradley, Modbus, etc.)" Sielco Sistemi Winlog has the capability to accept remote connections by enabling the "Run TCP/IP server" option. The server listens on port 46823/tcp. A specially crafted packet from a remote attacker can cause a stack overflow possibly allowing an attacker to execute arbitrary code.

For additional information see ICS-CERT Advisory ICSA-11-017-02.

Public exploit code is available for this vulnerability.


A remote attacker can cause the device to crash and may be able to execute arbitrary code.



Sielco Sistemi recommends that users update their Winlog Lite and Winlog Pro to version 2.07.01.

Restrict Access

Enable firewall rules to restrict access for port 46823/tcp to only trusted sources.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate Updated
SielcoAffected-19 Jan 2011
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to Luigi Auriemma for reporting this vulnerability.

This document was written by Michael Orlando.

Other Information

  • CVE IDs: CVE-2011-0517
  • Date Public: 17 Jan 2011
  • Date First Published: 03 Feb 2011
  • Date Last Updated: 03 Feb 2011
  • Severity Metric: 1.10
  • Document Revision: 13


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