CVE-2026-27778
📋 TL;DR
This CVE describes a WebSocket API vulnerability where missing rate limiting on authentication requests allows attackers to conduct denial-of-service attacks against charger telemetry systems or brute-force attacks for unauthorized access. It affects systems using the vulnerable WebSocket API implementation, particularly in charging infrastructure.
💻 Affected Systems
- ePower charging systems with vulnerable WebSocket API
⚠️ 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 disruption of charger telemetry systems leading to operational failure, or unauthorized administrative access allowing full system compromise.
Likely Case
Service degradation through DoS attacks or successful brute-force attacks gaining limited unauthorized access.
If Mitigated
Minimal impact with proper rate limiting and monitoring in place.
🎯 Exploit Status
Simple script-based attacks possible due to missing rate limiting.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched versions
Vendor Advisory: https://epower.ie/support/
Restart Required: Yes
Instructions:
1. Contact ePower support for patch details. 2. Apply vendor-provided update. 3. Restart affected systems. 4. Verify rate limiting is enabled.
🔧 Temporary Workarounds
Implement WebSocket rate limiting
allAdd rate limiting to WebSocket authentication endpoints
# Configuration depends on specific WebSocket implementation
Network segmentation
allRestrict access to WebSocket endpoints
# Use firewall rules to limit source IPs
🧯 If You Can't Patch
- Implement network-level rate limiting using WAF or firewall
- Monitor authentication logs for brute-force patterns and block suspicious IPs
🔍 How to Verify
Check if Vulnerable:
Test WebSocket authentication endpoints for absence of rate limiting using tools like Burp Suite or custom scripts.Check Version:
Check system firmware/software version via vendor-specific methods.Verify Fix Applied:
Verify rate limiting is enforced by sending multiple authentication requests and confirming throttling occurs.📡 Detection & Monitoring
Log Indicators:
- High frequency of authentication failures from single IP
- WebSocket connection spikes
Network Indicators:
- Unusual volume of WebSocket authentication traffic
- Pattern of rapid authentication attempts
SIEM Query:
source_ip=* AND (event_type="authentication_failure" OR protocol="websocket") COUNT BY source_ip OVER 1m > 10