Overview
The CVE-2025-31700 is a critical security vulnerability discovered in the Dahua products. This vulnerability, if exploited, could potentially disrupt services or even execute remote code without user interaction. Given the widespread use of Dahua products, this vulnerability poses a significant threat to organizations and individuals alike, making it pertinent to understand its intricacies, potential impacts, and the steps required for mitigation.
Vulnerability Summary
CVE ID: CVE-2025-31700
Severity: High (8.1 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Possible system compromise and data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Dahua DVR | All versions
Dahua IP Camera | All versions
How the Exploit Works
The exploit takes advantage of a buffer overflow vulnerability in Dahua products. Attackers can send specially crafted malicious packets to the device, causing a buffer overflow. This could lead to service disruption, such as crashes, or even remote code execution (RCE). While some devices may have protection mechanisms like Address Space Layout Randomization (ASLR) decreasing the chances of successful RCE exploitation, denial-of-service (DoS) attacks are still a viable threat.
Conceptual Example Code
This is a conceptual example of what a malicious packet might look like. This is not a real exploit code, but is designed to illustrate the concept of a buffer overflow attack.
$ echo -e "GET / HTTP/1.1\r\nHost: vulnerabledevice\r\n$(python -c 'print "A"*5000')\r\n\r\n" | nc vulnerabledevice 80This conceptual example sends a GET request with an overly long header value, potentially causing a buffer overflow in the Dahua device. Here, ‘A’*5000 symbolizes a string of arbitrary length designed to overflow the buffer. The nc command sends this request to the vulnerable device.
Mitigation Guidance
Dahua has released a vendor patch that fixes this vulnerability, and it is strongly recommended for all users to apply this patch immediately. If the patch cannot be applied right away, deploying a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation. These systems can detect and block malicious packets, preventing an attacker from exploiting this vulnerability.