CVE-2025-67731
📋 TL;DR
Servify Express versions before 1.2 have a denial-of-service vulnerability where attackers can send extremely large JSON request bodies, causing excessive memory usage, degraded performance, or process crashes. This affects any application using the package's default configuration and exposed to untrusted clients. The issue stems from missing request size limits in the JSON parser configuration.
💻 Affected Systems
- servify-express
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete service outage due to process crashes or memory exhaustion, making the application unavailable to legitimate users.
Likely Case
Degraded performance and intermittent service disruptions from memory pressure and CPU spikes processing oversized requests.
If Mitigated
Minimal impact with proper request size limits and monitoring in place.
🎯 Exploit Status
Exploitation requires no authentication and uses simple oversized HTTP requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2
Vendor Advisory: https://github.com/Aarondoran/servify-express/security/advisories/GHSA-qgc4-8p88-4w7m
Restart Required: Yes
Instructions:
1. Update package.json to specify servify-express version 1.2 or higher. 2. Run 'npm update servify-express'. 3. Restart the application.
🔧 Temporary Workarounds
Add JSON parser limit
allManually configure Express JSON parser with size limit
app.use(express.json({ limit: '1mb' }))
NGINX reverse proxy limit
linuxConfigure NGINX to limit request body size
client_max_body_size 1m;
🧯 If You Can't Patch
- Implement rate limiting at application or reverse-proxy level
- Deploy WAF rules to reject unusually large requests before parsing
🔍 How to Verify
Check if Vulnerable:
Check package.json for servify-express version below 1.2Check Version:
npm list servify-expressVerify Fix Applied:
Verify servify-express version is 1.2 or higher in package.json and node_modules📡 Detection & Monitoring
Log Indicators:
- Unusually large request bodies in access logs
- Memory usage spikes in application logs
- Process restart events
Network Indicators:
- Large HTTP POST requests to JSON endpoints
- High bandwidth consumption from single sources
SIEM Query:
source="app_logs" AND (message="memory" OR message="crash") AND request_size>1000000