MegaSys Enterprises Telenium Online Web Application
Act Now9.8ICS-CERT ICSA-25-273-01Sep 30, 2025
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
Telenium Online Web Application versions 8.4.21 and earlier are vulnerable to unauthenticated command injection via crafted HTTP requests. Successful exploitation allows an attacker to execute arbitrary operating system commands in the security context of the web application service account, potentially leading to compromise of connected industrial control systems, data theft, or operational disruption.
What this means
What could happen
An unauthenticated attacker could inject and execute arbitrary operating system commands on the Telenium Online server, potentially gaining full control over the web application service account and any connected industrial processes or data it manages.
Who's at risk
Oil and gas operators who rely on Telenium Online Web Application version 8.4.21 or earlier for process monitoring, control system integration, or remote asset management. This includes organizations using the application for SCADA system oversight, pipeline operations, or production facility management.
How it could be exploited
An attacker sends a crafted HTTP request with injected operating system commands to the Telenium Online Web Application. The application fails to properly sanitize user input and passes the malicious commands directly to the operating system for execution with the privileges of the web service account.
Prerequisites
- Network access to the Telenium Online Web Application (typically HTTP/HTTPS port 80 or 443)
- No authentication required
- Application must be exposed to the attacker's network (internet or internal network)
Remotely exploitable over HTTP/HTTPSNo authentication requiredLow complexity attackCommand injection vulnerability (CWE-78)High CVSS score (9.8)Vendor fix exists but not yet applied to most installations
Exploitability
Moderate exploit probability (EPSS 1.3%)
Affected products (1)
ProductAffected VersionsFix Status
Telenium Online Web Application: <=8.4.21≤ 8.4.21Fix available
Remediation & Mitigation
0/6
Do now
0/2WORKAROUNDRestrict network access to the Telenium Online Web Application; ensure it is not directly accessible from the internet
WORKAROUNDDeploy firewall rules to limit access to the application to only authorized internal networks or specific IP addresses
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HOTFIXApply the vendor fix from Megasys Enterprises by accessing the Megasys support page for patching instructions
Long-term hardening
0/3HARDENINGIf remote access is required, implement a Virtual Private Network (VPN) to encapsulate traffic and add an authentication layer
HARDENINGSegment the control system network from the business network to prevent lateral movement if the application is compromised
HARDENINGMonitor and log all HTTP requests and system command execution on the Telenium Online server for suspicious activity
CVEs (1)
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