CVE-2025-13165: EasyFlow GP DoS Vulnerability

CVE-2025-13165 Overview

EasyFlow GP, developed by Digiwin, contains a Denial of Service (DoS) vulnerability that allows unauthenticated remote attackers to send specific requests that result in the denial of web service. This vulnerability is classified under CWE-770 (Allocation of Resources Without Limits or Throttling), indicating that the application fails to properly limit resource consumption when processing malicious requests.

Critical Impact

Unauthenticated attackers can remotely disrupt EasyFlow GP web services, potentially causing significant business disruption for organizations relying on this workflow automation platform.

Affected Products

• EasyFlow GP by Digiwin (specific versions not disclosed)

Discovery Timeline

• 2025-11-17 - CVE-2025-13165 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-13165

Vulnerability Analysis

This Denial of Service vulnerability in EasyFlow GP stems from improper resource allocation handling (CWE-770). The application fails to implement adequate throttling or resource limits when processing incoming requests. This design flaw enables remote attackers to exhaust server resources without requiring any authentication credentials, making the attack surface particularly accessible to malicious actors.

The vulnerability is network-accessible with low attack complexity, requiring no privileges or user interaction to exploit. The primary impact is on system availability, as successful exploitation renders the web service unavailable to legitimate users.

Root Cause

The root cause lies in the application's failure to implement proper resource allocation controls. CWE-770 (Allocation of Resources Without Limits or Throttling) indicates that EasyFlow GP does not adequately restrict the amount of resources allocated when processing specific types of requests. This allows attackers to craft requests that consume excessive server resources such as memory, CPU cycles, or connection pools, ultimately leading to service degradation or complete unavailability.

Attack Vector

The attack vector is network-based, allowing remote exploitation without authentication. Attackers can send specially crafted requests to the EasyFlow GP web service that trigger excessive resource consumption. Since no authentication is required, the attack can be launched by any attacker with network access to the vulnerable service.

The exploitation flow typically involves:

1. Identifying an exposed EasyFlow GP web service endpoint
2. Crafting specific requests designed to trigger resource exhaustion
3. Sending these requests repeatedly to consume server resources
4. Causing the web service to become unresponsive to legitimate users

For detailed technical information about the vulnerability, refer to the TWCERT Security Advisory.

Detection Methods for CVE-2025-13165

Indicators of Compromise

• Unusual spike in incoming requests to EasyFlow GP endpoints from single or distributed sources
• Abnormal resource consumption (CPU, memory, or network connections) on servers hosting EasyFlow GP
• Web service becoming unresponsive or experiencing significant performance degradation
• Error logs indicating resource exhaustion or connection timeouts

Detection Strategies

• Implement network traffic analysis to identify anomalous request patterns targeting EasyFlow GP services
• Configure application performance monitoring to alert on unusual resource consumption spikes
• Deploy web application firewalls (WAF) with rate limiting rules to detect and block potential DoS attempts
• Monitor server health metrics including CPU utilization, memory usage, and active connections

Monitoring Recommendations

• Establish baseline metrics for normal EasyFlow GP service operation to identify deviations
• Configure real-time alerting for sudden increases in request volume or error rates
• Implement logging for all incoming requests to enable forensic analysis during incidents
• Set up automated health checks to quickly detect service availability issues

How to Mitigate CVE-2025-13165

Immediate Actions Required

• Contact Digiwin for official security patches or updates addressing this vulnerability
• Implement rate limiting at the network or application layer to restrict request frequency
• Deploy web application firewall (WAF) rules to filter potentially malicious requests
• Consider restricting network access to EasyFlow GP services to trusted IP ranges where possible
• Increase monitoring on affected systems to detect exploitation attempts early

Patch Information

Organizations should consult the TWCERT Security Advisory and the TWCERT Security Notice for official patch information from Digiwin. Contact the vendor directly for the latest security updates and remediation guidance.

Workarounds

• Implement network-level rate limiting using load balancers or reverse proxies to throttle incoming requests
• Configure firewall rules to limit connections per source IP to EasyFlow GP services
• Deploy the application behind a reverse proxy or CDN with DDoS protection capabilities
• If feasible, restrict access to the EasyFlow GP service to only authorized IP addresses or VPN users
• Consider implementing connection timeouts and request size limits at the web server level

# Example nginx rate limiting configuration
# Add to nginx.conf or server block

# Define rate limiting zone (10 requests per second per IP)
limit_req_zone $binary_remote_addr zone=easyflow_limit:10m rate=10r/s;

# Apply to EasyFlow GP location
location /easyflow/ {
    limit_req zone=easyflow_limit burst=20 nodelay;
    limit_conn_status 429;
    proxy_pass http://easyflow_backend;
}