CVE-2021-25848
📋 TL;DR
CVE-2021-25848 is an out-of-bounds read vulnerability in Moxa VPort 06EC-2V Series IP cameras. Attackers can send specially crafted LLDP packets to disclose sensitive information from device memory. This affects users of Moxa VPort 06EC-2V Series IP cameras version 1.1.
💻 Affected Systems
- Moxa VPort 06EC-2V Series IP cameras
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise leading to unauthorized access to camera feeds, device configuration, and potential lateral movement within the network.
Likely Case
Information disclosure including sensitive device data, configuration details, and potentially authentication credentials from memory.
If Mitigated
Limited information leakage with proper network segmentation and access controls in place.
🎯 Exploit Status
Exploitation requires sending crafted LLDP packets to the vulnerable service, which doesn't require authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version 1.2 or later
Vendor Advisory: https://www.moxa.com/en/support/product-support/security-advisory/vport-06ec-2v-series-ip-cameras-vulnerabilities
Restart Required: Yes
Instructions:
1. Download firmware version 1.2 or later from Moxa support site. 2. Log into camera web interface. 3. Navigate to Maintenance > Firmware Upgrade. 4. Upload the new firmware file. 5. Wait for upgrade to complete and device to reboot.
🔧 Temporary Workarounds
Disable LLDP service
linuxDisable the LLDP service to prevent exploitation via crafted LLDP packets.
ssh admin@camera-ip
configure terminal
no lldp enable
write memory
exit
Network segmentation
allIsolate cameras on separate VLANs with strict firewall rules.
🧯 If You Can't Patch
- Segment cameras on isolated network segments with strict firewall rules blocking LLDP traffic from untrusted sources.
- Implement network monitoring to detect anomalous LLDP traffic patterns targeting camera devices.
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface at System > Information or via SSH command 'show version'.Check Version:
ssh admin@camera-ip 'show version'Verify Fix Applied:
Verify firmware version is 1.2 or later and test with LLDP packet fuzzing tools.📡 Detection & Monitoring
Log Indicators:
- Unusual LLDP packet sizes or malformed LLDP traffic in network logs
- Memory access violations in system logs
Network Indicators:
- Abnormal LLDP traffic to camera devices
- Multiple LLDP packets with unusual TLV lengths
SIEM Query:
source_ip=* AND dest_ip=camera_ip AND protocol=LLDP AND packet_size>1500