CVE-2025-31703 | Dahua NVR2-4KS3/XVR4232AN-I/T/XVR1B16H-I authentication bypass (EUVD-2025-208815)

VDB-351509 · CVE-2025-31703 · EUVD-2025-208815 DAHUA NVR2-4KS3/XVR4232AN-I/T/XVR1B16H-I AUTHENTICATION BYPASS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.3 $0-$5k 0.59 Summaryinfo A vulnerability marked as problematic has been reported in Dahua NVR2-4KS3, XVR4232AN-I, T and XVR1B16H-I. This issue affects some unknown processing. The manipulation leads to authentication bypass. This vulnerability is traded as CVE-2025-31703. It is possible to launch the attack on the physical device. There is no exploit available. Detailsinfo A vulnerability was found in Dahua NVR2-4KS3, XVR4232AN-I, T and XVR1B16H-I (the affected version is unknown) and classified as problematic. This issue affects an unknown code. The manipulation with an unknown input leads to a authentication bypass vulnerability. Using CWE to declare the problem leads to CWE-305. The authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error. Impacted is confidentiality, integrity, and availability. The summary by CVE is: 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. The advisory is shared at dahuasecurity.com. The identification of this vulnerability is CVE-2025-31703 since 04/01/2025. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-208815). Productinfo Vendor Dahua Name NVR2-4KS3 T XVR1B16H-I XVR4232AN-I License commercial CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.3 VulDB Base Score: 4.3 VulDB Temp Score: 4.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authentication bypass CWE: CWE-305 / CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: Yes Local: Yes Remote: No Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/01/2025 CVE reserved 03/18/2026 +351 days Advisory disclosed 03/18/2026 +0 days VulDB entry created 03/18/2026 +0 days VulDB entry last update Sourcesinfo Advisory: dahuasecurity.com Status: Not defined CVE: CVE-2025-31703 (🔒) GCVE (CVE): GCVE-0-2025-31703 GCVE (VulDB): GCVE-100-351509 EUVD: 🔒 Entryinfo Created: 03/18/2026 09:18 Updated: 03/18/2026 11:42 Changes: 03/18/2026 09:18 (62), 03/18/2026 11:42 (1) Complete: 🔍 Cache ID: 99:167:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸