CVE-2025-31700
📋 TL;DR
A buffer overflow vulnerability in Dahua products allows attackers to send specially crafted packets that could cause service crashes or potentially execute arbitrary code remotely. This affects Dahua devices running vulnerable firmware versions. Organizations using these devices for surveillance or security purposes are at risk.
💻 Affected Systems
- Dahua IP cameras
- Dahua NVRs
- Dahua DVRs
- Other Dahua security devices
⚠️ 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, and lateral movement within the network.
Likely Case
Denial-of-service through service crashes, disrupting surveillance/security functions and requiring manual device restart.
If Mitigated
Limited to denial-of-service if ASLR is properly implemented, preventing reliable code execution but still causing service disruption.
🎯 Exploit Status
Buffer overflow exploitation requires crafting specific packets. ASLR reduces RCE reliability but DoS is simpler to achieve.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific fixed firmware versions
Vendor Advisory: https://www.dahuasecurity.com/aboutUs/trustedCenter/details/775
Restart Required: Yes
Instructions:
1. Visit the Dahua Trust Center advisory. 2. Identify your device model. 3. Download the latest firmware. 4. Follow Dahua's firmware update procedure. 5. Reboot the device after update.
🔧 Temporary Workarounds
Network Segmentation
allIsolate Dahua devices in separate VLANs with strict firewall rules
Access Control Lists
allRestrict network access to Dahua devices to authorized management IPs only
🧯 If You Can't Patch
- Segment devices behind firewalls with strict inbound/outbound rules
- Implement network monitoring for abnormal packet patterns to Dahua devices
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor advisory. Vulnerable if running unpatched firmware.Check Version:
Check via device web interface: System > Information > Version, or via SSH: cat /etc/versionVerify Fix Applied:
Verify firmware version matches or exceeds patched version listed in vendor advisory.📡 Detection & Monitoring
Log Indicators:
- Device crash/restart logs
- Abnormal packet size errors in network logs
- Failed service startup attempts
Network Indicators:
- Unusual large packets to Dahua device ports
- Multiple connection attempts with malformed data
SIEM Query:
source="dahua-device" AND (event="crash" OR event="restart" OR message="*buffer*" OR message="*overflow*")