CVE-2025-1059 Overview
CVE-2025-1059 is a resource exhaustion vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Schneider Electric devices. The vulnerability exists in the device webserver and can cause communications to stop when malicious packets are sent to the affected system. This denial of service condition occurs because the webserver fails to implement proper resource allocation limits, allowing an attacker to exhaust available resources through crafted network requests.
Critical Impact
Remote attackers can cause a complete denial of service by sending malicious packets to the device webserver, disrupting industrial communications and potentially affecting operational technology (OT) environments.
Affected Products
- Schneider Electric devices with vulnerable webserver components
- Industrial control system devices exposed to network access
- OT/ICS infrastructure utilizing affected Schneider Electric products
Discovery Timeline
- February 13, 2025 - CVE-2025-1059 published to NVD
- April 15, 2026 - Last updated in NVD database
Technical Details for CVE-2025-1059
Vulnerability Analysis
This vulnerability stems from insufficient resource management in the webserver component of affected Schneider Electric devices. The webserver fails to implement proper throttling or limits on resource allocation when processing incoming network requests. An unauthenticated remote attacker can exploit this weakness by sending specially crafted malicious packets to the webserver, causing the device to allocate resources without bounds until communications are disrupted.
The attack requires no user interaction and can be executed from the network with low complexity. While the vulnerability does not impact confidentiality or integrity, it severely affects availability, potentially causing complete denial of service to the affected device.
Root Cause
The root cause is the absence of proper resource allocation limits and throttling mechanisms in the device webserver. When processing incoming requests, the webserver allocates memory and system resources without implementing upper bounds or rate limiting. This allows an attacker to force the system into a resource-exhausted state by flooding it with malicious packets designed to consume all available resources.
Attack Vector
The attack is conducted over the network without requiring authentication or user interaction. An attacker sends specially crafted packets to the webserver that trigger unbounded resource allocation. As the webserver continues to allocate resources for each malicious request without proper limits or cleanup, the device eventually exhausts available memory or processing capacity, causing communications to halt.
The vulnerability is particularly concerning in industrial control system (ICS) and operational technology (OT) environments where device availability is critical for maintaining safe operations. Attackers with network access to the device webserver can repeatedly exploit this vulnerability to cause persistent denial of service conditions.
Detection Methods for CVE-2025-1059
Indicators of Compromise
- Unusual spikes in network traffic directed at the device webserver port
- Device communication failures or unresponsive webserver interfaces
- Memory utilization anomalies on affected Schneider Electric devices
- Repeated connection attempts from unknown or suspicious IP addresses
Detection Strategies
- Monitor network traffic for abnormal packet volumes targeting device webservers
- Implement anomaly detection for resource utilization patterns on industrial devices
- Configure alerts for webserver unresponsiveness or communication failures
- Deploy network intrusion detection systems (NIDS) with rules for resource exhaustion attacks
Monitoring Recommendations
- Establish baseline network traffic patterns for industrial device communications
- Monitor device health metrics including memory usage and CPU utilization
- Implement centralized logging for webserver access attempts and errors
- Configure real-time alerting for denial of service indicators in OT environments
How to Mitigate CVE-2025-1059
Immediate Actions Required
- Review the Schneider Electric Security Notice for detailed mitigation guidance
- Implement network segmentation to limit access to vulnerable device webservers
- Apply firewall rules to restrict webserver access to authorized IP addresses only
- Monitor affected devices for signs of exploitation or denial of service conditions
Patch Information
Schneider Electric has released security guidance for this vulnerability. Administrators should consult the Schneider Electric Security Notice (SEVD-2025-042-01) for specific patch information, affected product versions, and remediation steps. Apply vendor-provided firmware updates as they become available to address this vulnerability.
Workarounds
- Disable the webserver interface if not required for operations
- Implement strict network access controls using firewalls and VLANs
- Deploy a web application firewall (WAF) or reverse proxy with rate limiting capabilities
- Enable connection throttling at the network perimeter to limit request rates
# Example firewall rule to restrict webserver access (adapt to your environment)
# Allow only authorized management networks to access device webserver
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
