CVE-2025-41707
📋 TL;DR
This CVE describes a denial-of-service vulnerability in a websocket handler where an unauthenticated remote attacker can send crafted websocket messages to trigger service disruption. The vulnerability does not affect core functionality but can cause availability issues. Any system using the vulnerable websocket implementation is affected.
💻 Affected Systems
- Specific product information not provided in CVE description
⚠️ 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 unavailability for the websocket component, potentially disrupting real-time communication features that depend on it.
Likely Case
Temporary service degradation or intermittent connection drops for websocket-based features, requiring service restart to recover.
If Mitigated
Minimal impact with proper rate limiting, input validation, and monitoring in place to detect and block malicious traffic patterns.
🎯 Exploit Status
Exploitation requires sending crafted websocket messages but does not require authentication. The CWE-120 (Buffer Copy without Checking Size of Input) suggests buffer-related issues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Specific version not provided in references
Vendor Advisory: https://certvde.com/de/advisories/VDE-2025-072
Restart Required: No
Instructions:
1. Check vendor advisory for specific patch version. 2. Apply the security update for the websocket handler component. 3. Verify the fix does not break existing websocket functionality.
🔧 Temporary Workarounds
Implement websocket input validation
allAdd input validation and size checking for incoming websocket messages to prevent crafted payloads from triggering the vulnerability.
Implementation specific to websocket framework/language
Rate limit websocket connections
allImplement connection rate limiting and message frequency restrictions to mitigate denial-of-service attempts.
Configuration depends on webserver/load balancer
🧯 If You Can't Patch
- Implement network-level filtering to block or limit websocket traffic from untrusted sources
- Deploy WAF rules to detect and block crafted websocket messages patterns
🔍 How to Verify
Check if Vulnerable:
Test by sending crafted websocket messages to the handler and monitoring for service degradation or crashes.Check Version:
Check application/component version against vendor's patched version listVerify Fix Applied:
After patching, attempt to send the same crafted messages and verify the service remains stable and responsive.📡 Detection & Monitoring
Log Indicators:
- Unusual websocket message patterns
- Websocket handler errors or crashes
- High volume of websocket connections from single sources
Network Indicators:
- Abnormal websocket traffic patterns
- Sudden spikes in websocket connections
- Malformed websocket frames in network captures
SIEM Query:
websocket AND (error OR crash OR "malformed") AND src_ip NOT IN trusted_ips