OServer Out of Bounds Read

8.3 CVSS

Vulnerability Description

The Modbus slave/outstation driver in the OPC Drivers 1.0.20 and earlier in IOServer OPC Server allows remote attackers to cause a denial of service (out-of-bounds read and daemon crash) via a crafted packet.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Chris Sistrunk of Mandiant and Adam Crain of Automatak

References

Affected Vendor

IOServer

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Affected Software

OPC Drivers

Vulnerable Versions:

Timeline

Official Publish: April 11th, 2014

Last Modified: September 24th, 2025

Added to House: July 19th, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-125

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

Initial Access

T1213 Data from Information Repositories

Collection

T1003 OS Credential Dumping

Credential Access

T1552 Unsecured Credentials