CVE-2025-45029
📋 TL;DR
This vulnerability allows attackers to execute arbitrary code or cause denial of service on WINSTAR WN572HP3 devices by exploiting a heap overflow in the upload.cgi script. Attackers can trigger this by sending specially crafted HTTP requests with manipulated CONTENT_LENGTH values. Only users of the affected WINSTAR device model are impacted.
💻 Affected Systems
- WINSTAR WN572HP3
⚠️ 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
Remote code execution leading to complete device compromise, data exfiltration, or persistent backdoor installation.
Likely Case
Denial of service causing device crashes or instability, potentially requiring physical reset.
If Mitigated
Limited impact if network segmentation prevents external access to the vulnerable endpoint.
🎯 Exploit Status
The vulnerability requires no authentication and has public technical details available. Heap overflow exploitation typically requires some skill but is well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://winstar.com
Restart Required: Yes
Instructions:
1. Check vendor website for firmware updates. 2. Download latest firmware. 3. Upload via device web interface. 4. Reboot device after installation.
🔧 Temporary Workarounds
Network Access Control
linuxBlock external access to the device's web interface using firewall rules.
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
CGI Script Disable
linuxRemove or disable the vulnerable upload.cgi script if device functionality allows.
rm /cgi-bin/upload.cgi
chmod 000 /cgi-bin/upload.cgi
🧯 If You Can't Patch
- Isolate device on separate VLAN with strict access controls.
- Implement WAF rules to block requests to /cgi-bin/upload.cgi with abnormal CONTENT_LENGTH values.
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or SSH. If version is v230525, device is vulnerable.Check Version:
cat /etc/version || grep -i version /proc/cpuinfoVerify Fix Applied:
Verify firmware version has changed from v230525. Test upload functionality to ensure CGI endpoint responds correctly.📡 Detection & Monitoring
Log Indicators:
- Multiple failed upload attempts
- Abnormal CONTENT_LENGTH values in web logs
- Device crash/restart logs
Network Indicators:
- HTTP POST requests to /cgi-bin/upload.cgi with manipulated headers
- Unusual traffic patterns to device web interface
SIEM Query:
source="web_logs" AND uri="/cgi-bin/upload.cgi" AND (content_length>1000000 OR content_length<0)