CVE-2025-41653
📋 TL;DR
An unauthenticated remote attacker can cause denial-of-service by sending specially crafted HTTP requests with malicious headers to the device's web server. This vulnerability affects devices with exposed web interfaces running vulnerable software versions. The attack requires no authentication and can render the web service unavailable.
💻 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 web server crash requiring manual restart, potentially disrupting all web-based management and services on the device.
Likely Case
Temporary service disruption affecting web interface availability, potentially requiring automatic or manual service restart.
If Mitigated
Minimal impact with proper network segmentation and web server hardening in place.
🎯 Exploit Status
Exploitation requires sending specially crafted HTTP requests with malicious headers to the vulnerable web server.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://certvde.com/en/advisories/VDE-2025-044/
Restart Required: Yes
Instructions:
1. Check vendor advisory for specific patch information. 2. Apply vendor-provided firmware/software updates. 3. Restart affected services or devices as required.
🔧 Temporary Workarounds
Network Segmentation
allRestrict access to web server interfaces using firewall rules
Web Server Hardening
allConfigure web server to reject malformed HTTP headers
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Deploy web application firewall (WAF) with DoS protection rules
🔍 How to Verify
Check if Vulnerable:
Check device version against vendor advisory and test with controlled HTTP header manipulationCheck Version:
Device-specific command - consult vendor documentationVerify Fix Applied:
Verify updated version and test with same HTTP requests that previously caused issues📡 Detection & Monitoring
Log Indicators:
- Multiple HTTP requests with malformed headers
- Web server crash/restart events
- Unusual spike in HTTP error responses
Network Indicators:
- HTTP traffic with unusual header patterns
- Sudden drop in web service availability
SIEM Query:
source="web_server" AND (http_header contains "malformed" OR http_status=400) | stats count by src_ip