CVE-2025-3710
📋 TL;DR
CVE-2025-3710 is a critical stack-based buffer overflow vulnerability in LCD KVM over IP Switch CL5708IM firmware that allows unauthenticated remote attackers to execute arbitrary code on affected devices. This affects all organizations using CL5708IM switches with firmware versions prior to v2.2.215. The vulnerability enables complete device compromise without authentication.
💻 Affected Systems
- LCD KVM over IP Switch CL5708IM
⚠️ 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 device takeover leading to lateral movement into internal networks, persistent backdoor installation, and disruption of KVM operations affecting server management.
Likely Case
Remote code execution allowing attackers to compromise the KVM switch, intercept or manipulate KVM sessions, and potentially pivot to connected servers.
If Mitigated
Limited impact if device is isolated in management network with strict access controls, though still vulnerable to internal threats.
🎯 Exploit Status
Unauthenticated remote exploitation with low complexity makes this highly dangerous. No public exploit code known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.2.215
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10103-32121-2.html
Restart Required: Yes
Instructions:
1. Download firmware v2.2.215 from vendor. 2. Backup current configuration. 3. Upload firmware via web interface. 4. Apply firmware update. 5. Reboot device. 6. Verify firmware version.
🔧 Temporary Workarounds
Network Segmentation
allIsolate KVM switches in dedicated management VLAN with strict firewall rules
Access Control Lists
allImplement IP-based access restrictions to limit connections to trusted management hosts only
🧯 If You Can't Patch
- Immediately isolate device from internet and restrict to management network only
- Monitor network traffic for suspicious connections to KVM switch management interface
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface or SSH. If version is below 2.2.215, device is vulnerable.Check Version:
Connect to device web interface and navigate to System Information page, or use SSH to check firmware version.Verify Fix Applied:
Verify firmware version shows 2.2.215 or higher in device web interface or via SSH.📡 Detection & Monitoring
Log Indicators:
- Unusual connection attempts to KVM management interface
- Firmware version change logs
- Unexpected device reboots
Network Indicators:
- Unusual traffic patterns to KVM switch management ports
- Connection attempts from unexpected IP addresses
- Malformed packets to KVM management interface
SIEM Query:
source_ip=* AND dest_port=(80,443,22) AND dest_ip=KVM_switch_IP AND event_type=connection_attempt