CVE-2025-51741
📋 TL;DR
An unauthenticated attacker can exploit this vulnerability in Veal98 Echo Open-Source Community System to send email verification messages to arbitrary users via the /sendEmailCodeForResetPwd endpoint. This can cause denial of service to the server or downstream users by overwhelming email services. All users running Echo versions 2.2 through 2.3 are affected.
💻 Affected Systems
- Veal98 Echo Open-Source Community System
📦 What is this software?
Echo by Interviewx
Echo by Interviewx
⚠️ Risk & Real-World Impact
Worst Case
Complete email service disruption for the organization, server resource exhaustion leading to system unavailability, and potential reputational damage from spam emails sent to users.
Likely Case
Email service degradation, increased server load, and user complaints about unsolicited password reset emails.
If Mitigated
Minimal impact with rate limiting and proper email service configurations in place.
🎯 Exploit Status
Simple HTTP POST requests to the vulnerable endpoint can trigger the vulnerability. Proof of concept is available in the GitHub gist reference.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: http://echo.com
Restart Required: No
Instructions:
1. Check the official Echo repository for security updates. 2. Monitor the vendor advisory URL for patch announcements. 3. Consider upgrading to a newer version if available.
🔧 Temporary Workarounds
Block Vulnerable Endpoint
allBlock access to the /sendEmailCodeForResetPwd endpoint at the web server or firewall level.
# Apache: RewriteRule ^/sendEmailCodeForResetPwd - [F]
# Nginx: location ~ ^/sendEmailCodeForResetPwd { return 403; }
Implement Rate Limiting
allConfigure rate limiting on the vulnerable endpoint to prevent abuse.
# Nginx: limit_req_zone $binary_remote_addr zone=emaillimit:10m rate=1r/s;
# Then apply to location block
🧯 If You Can't Patch
- Implement web application firewall rules to block suspicious requests to the vulnerable endpoint.
- Monitor email service logs for unusual spikes in password reset requests and implement alerting.
🔍 How to Verify
Check if Vulnerable:
Send a POST request to /sendEmailCodeForResetPwd with arbitrary email parameters. If it returns success without authentication, the system is vulnerable.Check Version:
Check the Echo system configuration or admin panel for version information.Verify Fix Applied:
Test the same request after applying workarounds - it should be blocked or rate limited.📡 Detection & Monitoring
Log Indicators:
- High frequency of POST requests to /sendEmailCodeForResetPwd endpoint
- Unusual spikes in email sending activity from the application
Network Indicators:
- Multiple HTTP POST requests to /sendEmailCodeForResetPwd from single IP addresses
- Abnormal traffic patterns to the vulnerable endpoint
SIEM Query:
source="web_logs" AND uri_path="/sendEmailCodeForResetPwd" AND count() > 10 per src_ip per 1min