CVE-2025-31702: Dahua Embedded Products Privilege Escalation

CVE-2025-31702 Overview

CVE-2025-31702 is an improper access control vulnerability affecting certain Dahua embedded products. An authenticated attacker with normal user credentials can access data restricted to administrator privileges by sending specific HTTP requests. The exposed data includes system-sensitive files that can be leveraged to tamper with the administrator password, resulting in privilege escalation.

The weakness is categorized under CWE-732 (Incorrect Permission Assignment for Critical Resource). Systems configured with only an administrator account are not affected because exploitation requires a non-admin credential as a starting point.

Critical Impact
Low-privileged authenticated users can escalate to administrator by reading sensitive files through crafted HTTP requests, enabling full device takeover.

Affected Products

Dahua embedded products (specific models and firmware versions listed in the vendor advisory)
Deployments with multiple user accounts (admin plus one or more standard users)
Devices exposing the HTTP management interface to network-reachable attackers

Discovery Timeline

2025-10-15 - CVE-2025-31702 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-31702

Vulnerability Analysis

The vulnerability resides in the HTTP request handling logic of affected Dahua embedded products. The web management interface enforces authentication but fails to consistently enforce role-based authorization on specific endpoints. A user authenticated with normal (non-admin) credentials can issue crafted HTTP requests that return data intended only for administrators.

Among the exposed data are system-sensitive files containing credential material. An attacker can parse or replay this material to tamper with the admin account password, converting a limited foothold into full administrative control of the device. Because many Dahua embedded products are deployed as network video recorders, IP cameras, and video management appliances, administrative takeover generally provides access to recorded footage, live streams, and downstream network segments.

Root Cause

The root cause is incorrect permission assignment on protected resources, consistent with [CWE-732]. The HTTP handlers for certain administrative resources validate that a session is authenticated but do not validate the role associated with that session. Normal users are therefore granted read access to files that the authorization model should restrict to the admin role.

Attack Vector

Exploitation is network-based and requires valid credentials for a standard (non-admin) account on the target device. The attacker sends a specific HTTP request to the vulnerable endpoint on the device's management interface and parses the returned sensitive files. The returned material is then used to modify the administrator password, after which the attacker authenticates as admin and controls the device. No user interaction is required, but attack complexity is high because the attacker must already possess working low-privilege credentials.

No verified public proof-of-concept code is available at this time. Refer to the Dahua Security Advisory #777 for vendor-provided technical details.

Detection Methods for CVE-2025-31702

Indicators of Compromise

Unexpected HTTP requests from standard user sessions to administrative endpoints on Dahua device management interfaces.
Administrator password changes that do not correlate with legitimate admin logins or scheduled maintenance.
New admin logins originating from IP addresses previously associated only with standard user accounts.
Access to system configuration or credential files by sessions whose authenticated role is not admin.

Detection Strategies

Review device web server access logs for standard-user sessions issuing requests to admin-only URIs, then returning HTTP 200 with large response bodies.
Alert on password-change API calls that follow suspicious file-read requests within a short time window.
Correlate authentication events: a standard user session immediately followed by an admin session from the same source IP is a strong signal.

Monitoring Recommendations

Forward Dahua device syslog and HTTP access logs to a centralized log platform for correlation and retention.
Baseline normal administrative activity hours and sources, then alert on deviations.
Monitor north-south traffic to camera and NVR management interfaces for unexpected clients, especially internal hosts that should not administer these devices.

How to Mitigate CVE-2025-31702

Immediate Actions Required

Apply the firmware update referenced in the Dahua Security Advisory #777 as soon as it is available for the affected model.
Audit all non-admin accounts on affected devices and remove accounts that are not strictly required.
Rotate the administrator password after patching to invalidate any credentials that may have been harvested.
Restrict management interface access to a dedicated administrative network or VPN.

Patch Information

Dahua has published mitigation guidance in Dahua Security Advisory #777. Administrators should identify affected product lines and firmware versions in the advisory and apply the vendor-provided firmware updates. Deployments that use only an administrator account are not affected and do not require patching for this specific issue, though keeping firmware current remains recommended.

Workarounds

Operate affected devices with only an administrator account where business requirements allow, since single-admin deployments are not affected.
Place device management interfaces behind a firewall or management VLAN that denies access from untrusted hosts.
Enforce strong, unique passwords on every account and rotate them regularly to limit the value of any compromised standard user credential.
Disable remote HTTP management from the internet; use a VPN or jump host for administration.

bash

# Example: restrict Dahua management interface to a trusted admin subnet using iptables on an upstream gateway
iptables -A FORWARD -p tcp -d <device_ip> --dport 80 -s 10.10.50.0/24 -j ACCEPT
iptables -A FORWARD -p tcp -d <device_ip> --dport 443 -s 10.10.50.0/24 -j ACCEPT
iptables -A FORWARD -p tcp -d <device_ip> --dport 80 -j DROP
iptables -A FORWARD -p tcp -d <device_ip> --dport 443 -j DROP