CVE-2025-70059: YMFE yapi DoS Vulnerability via CWE-400

CVE-2025-70059 Overview

CVE-2025-70059 is a high-severity Uncontrolled Resource Consumption vulnerability (CWE-400) discovered in YMFE YApi version 1.12.0. This vulnerability allows remote attackers to cause a denial of service by exhausting system resources without authentication. YApi is an open-source API management platform commonly used by development teams for API documentation, testing, and mock services.

Critical Impact

Attackers can exploit this vulnerability to render YApi services unavailable, disrupting API development workflows and potentially impacting dependent applications and services.

Affected Products

• YMFE YApi v1.12.0

Discovery Timeline

• 2026-03-09 - CVE-2025-70059 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2025-70059

Vulnerability Analysis

This vulnerability stems from improper handling of resource consumption within YMFE YApi v1.12.0. The application fails to implement adequate controls over the amount of system resources that can be consumed by incoming requests. As a result, an attacker can send specially crafted requests that consume excessive CPU, memory, or other system resources, leading to service degradation or complete denial of service.

The vulnerability is exploitable over the network without requiring any authentication or user interaction, making it accessible to any attacker with network connectivity to the YApi instance. While the vulnerability does not compromise the confidentiality or integrity of data, it can severely impact the availability of the service.

Root Cause

The root cause of CVE-2025-70059 is inadequate resource management within the YApi application. The software does not properly limit or throttle resource-intensive operations, allowing attackers to trigger unbounded resource consumption. This type of vulnerability often arises when applications lack:

• Request rate limiting mechanisms
• Input size validation
• Timeouts on processing operations
• Memory allocation limits for user-controlled input

Attack Vector

The attack vector for this vulnerability is network-based, requiring no privileges or user interaction. An attacker can exploit this vulnerability by:

1. Identifying an exposed YApi instance (default port is typically 3000)
2. Crafting malicious requests designed to consume excessive resources
3. Sending repeated requests to exhaust server resources
4. Causing service degradation or complete denial of service

The vulnerability allows unauthenticated remote attackers to impact service availability. For detailed technical analysis, see the security research post on GitHub Gist.

Detection Methods for CVE-2025-70059

Indicators of Compromise

• Unusual spikes in CPU or memory utilization on servers hosting YApi
• Abnormally high number of requests from single IP addresses or ranges
• YApi service becoming unresponsive or experiencing significant latency
• Server logs showing repeated requests to resource-intensive endpoints
• Out-of-memory errors or process crashes in YApi application logs

Detection Strategies

• Configure monitoring alerts for abnormal resource consumption patterns on YApi servers
• Implement log analysis to detect high-volume request patterns from individual sources
• Deploy web application firewalls (WAF) with rate limiting capabilities
• Monitor application response times for degradation indicative of resource exhaustion
• Use intrusion detection systems (IDS) to identify potential DoS attack patterns

Monitoring Recommendations

• Establish baseline metrics for normal YApi resource utilization and alert on deviations
• Implement real-time monitoring of server CPU, memory, and network bandwidth
• Configure application performance monitoring (APM) for YApi response time tracking
• Enable detailed request logging to facilitate forensic analysis
• Set up automated alerting for service availability and health checks

How to Mitigate CVE-2025-70059

Immediate Actions Required

• Restrict network access to YApi instances using firewall rules and network segmentation
• Implement rate limiting at the network or application layer to prevent resource exhaustion
• Deploy a reverse proxy or load balancer with DoS protection capabilities
• Monitor YApi instances for unusual resource consumption patterns
• Consider temporarily limiting access to trusted IP ranges if under active attack

Patch Information

At the time of publication, no official patch has been released by YMFE for this vulnerability. Organizations should monitor the YMFE YApi GitHub repository for security updates and upgrade to patched versions when available.

For additional context on this vulnerability, refer to the security advisory on GitHub Gist.

Workarounds

• Deploy YApi behind a reverse proxy (such as nginx) with request rate limiting configured
• Implement connection limits and timeouts at the web server level
• Use cloud-based DDoS protection services to filter malicious traffic
• Restrict access to YApi to internal networks or VPN-only access where possible
• Configure resource limits (ulimits) at the operating system level for the YApi process

# Example nginx rate limiting configuration
limit_req_zone $binary_remote_addr zone=yapi_limit:10m rate=10r/s;

server {
    location / {
        limit_req zone=yapi_limit burst=20 nodelay;
        proxy_pass http://localhost:3000;
        proxy_connect_timeout 30s;
        proxy_read_timeout 30s;
    }
}