CVE-2025-31703 | BDVDB-2026-320939 Detail

dahuaNVR2-4KS3

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.

Impact#

CAPEC-233 Privilege Escalation

Weaknesses#

CWE-305 Authentication bypass by primary weakness

References#

https://www.dahuasecurity.com/about-dahua/trust-center/dahua-psirt/security-advisory-%E2%80%93-vulnerability-found-in-dahua-nvr-xvr-device

Exploit#

No public exploit known

History#

Version 12026-03-18Record published in the CVE List.

Published

Published: 2026-03-18
Last modified: 2026-03-18

Vendor information

Vendor: dahua
Product: NVR2-4KS3

All dahua vulnerabilities

Score

2.4 Low

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 22.4.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
Versions which Build time prior to 3rd March 2026
Fixed
Not stated

Scoring System

CVSS v4.0

2.4 Low

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

Metric breakdown
Attack Vector	Physical
Attack Complexity	Low
Attack Requirements	None
Privileges Required	None
User Interaction	None
Vulnerable System Confidentiality	Low
Vulnerable System Integrity	Low
Vulnerable System Availability	None
Subsequent System Confidentiality	Low
Subsequent System Integrity	Low
Subsequent System Availability	None

CVSS v3.1

Not available

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).