Advantech WebAccess Vulnerabilities
Act NowICS-CERT ICSA-14-198-02Apr 19, 2014
Summary
Advantech WebAccess contains multiple vulnerabilities across buffer overflow (CWE-121), information exposure (CWE-623), insufficient input validation (CWE-592), sensitive data exposure (CWE-316), and improper access control (CWE-284). All versions are affected.
What this means
What could happen
An attacker could gain unauthorized access to WebAccess, extract sensitive operational data, or execute arbitrary code to manipulate process parameters and controls in supervisory systems.
Who's at risk
Water utilities and electric utilities using Advantech WebAccess for SCADA/HMI supervisory functions. This includes operators managing remote pump stations, treatment plants, substations, or any facility relying on WebAccess for real-time monitoring and control of critical infrastructure.
How it could be exploited
An attacker with network access to the WebAccess interface could exploit the buffer overflow or access control weaknesses to bypass authentication, read sensitive configuration or historian data, or inject malicious commands into the supervisory control logic.
Prerequisites
- Network access to WebAccess HTTP/HTTPS port (typically 80 or 443)
- WebAccess instance must be reachable from attacker's network position
remotely exploitableno patch availablehigh EPSS score (40.2%)affects supervisory systemsmultiple vulnerability types
Exploitability
High exploit probability (EPSS 40.2%)
Affected products (1)
ProductAffected VersionsFix Status
Advantech WebAccess: vers:all/*All versionsNo fix (EOL)
Remediation & Mitigation
0/5
Do now
0/2WORKAROUNDImplement firewall rules to restrict WebAccess access to authorized engineering workstations and administrative networks only; block external/untrusted access to WebAccess HTTP/HTTPS ports
HARDENINGRequire strong authentication credentials for all WebAccess user accounts; disable default accounts if present
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HARDENINGMonitor WebAccess logs for suspicious authentication attempts, buffer overflow payloads, or unusual data access patterns
Mitigations - no patch available
0/2Advantech WebAccess: vers:all/* has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGDeploy WebAccess instances on isolated OT network segments separated from corporate and external networks using air-gapping or demilitarized zones (DMZ)
HARDENINGEvaluate replacement or retirement of affected WebAccess instances if patch availability is critical to your operations; contact Advantech for end-of-life product options
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