title: Advantech WebAccess
description: Advantech WebAccess versions 9.02 and prior are vulnerable to a heap-based buffer overflow, which may allow an attacker to remotely execute code.
problem types: HEAP-BASED BUFFER OVERFLOW CWE-122
affected:
{
product: WebAccess
vendor: Advantech
versions:
lessThanOrEqual: 9.02, status: affected, version: All, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 9.8
baseSeverity: CRITICAL
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
solutions: In order to address the heap-based buffer overflow vulnerability, Advantech recommends users directly add the remote access code to avoid being attacked by unknown requests. This is the remote access code established during installation of the Advantech WebAccess SCADA software (SCADA node, project node, or OPC Service) on the OPC Server computer. The access code you enter here must match the remote access code established during installation on the OPC Server. This prevents unauthorized users from accessing the OPC Server data using the Advantech WebAccess SCADA OPC Service.
If you have forgotten the remote access code using during software installation on the OPC Server node, you have two options:
Re-install the Advantech WebAccess SCADA software on the OPC Server node to change it and edit it to match in your database.
Edit the BWSERVER.INI file on the OPC Server node and edit it to match in your database using UPDATE.