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CVE-2025-31703

Quick assessment

Affected
dahua NVR2-4KS3
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Dahua NVR和Dahua XVR都是中国大华（Dahua）公司的产品。Dahua NVR是一系列网络视频录像机。Dahua XVR是一系列能够录制和显示高清和 Ip 摄像机的设备。 Dahua NVR和Dahua XVR存在安全漏洞，该漏洞源于物理访问串行端口可绕过身份验证机制，可能导致权限提升。以下版本受到影响：Dahua NVR2-4KS3、Dahua XVR4232AN-I/T和Dahua XVR1B16H-I/T。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.23% · P13
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I. Basic Information for CVE-2025-31703

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用基本弱点进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Dahua NVR和Dahua XVR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Dahua NVR和Dahua XVR都是中国大华（Dahua）公司的产品。Dahua NVR是一系列网络视频录像机。Dahua XVR是一系列能够录制和显示高清和 Ip 摄像机的设备。 Dahua NVR和Dahua XVR存在安全漏洞，该漏洞源于物理访问串行端口可绕过身份验证机制，可能导致权限提升。以下版本受到影响：Dahua NVR2-4KS3、Dahua XVR4232AN-I/T和Dahua XVR1B16H-I/T。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
dahua NVR2-4KS3 Versions which Build time prior to 3rd March 2026 -
dahua XVR4232AN-I/T Versions which Build time prior to 3rd March 2026 -
dahua XVR1B16H-I/T Versions which Build time prior to 3rd March 2026 -

II. Public POCs for CVE-2025-31703

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III. Intelligence Information for CVE-2025-31703

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Vendor Advisories for CVE-2025-31703 (1)

IV. Related Vulnerabilities

Same vendor: dahua
Same weakness: CWE-305

V. Comments for CVE-2025-31703

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