CVE-2025-31703 Auth bypass in NVR2-4KS3
Attackers with physical access can bypass serial port authentication to gain restricted shell access and escalate privileges on Dahua NVR/XVR devices.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-31703?
CVE-2025-31703 is a low-severity authentication bypass vulnerability in dahua NVR2-4KS3, published on 18 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability found in Dahua NVR/XVR device. A third-party malicious attacker with physical access to the device may gain access to a restricted shell via the serial port, and bypasses the shell's authentication mechanism to escalate privileges.
Weakness: CWE-305
Which versions are affected by CVE-2025-31703?
How do I fix CVE-2025-31703?
No fix has been published for CVE-2025-31703 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2025-31703 being exploited?
There is no known exploitation of CVE-2025-31703 in the wild and no public exploit code.
Sources
Also known as GHSA-26qr-26wf-xv6x.