Authentication bypass in Dahua NVR2-4KS3
Priority LOW 12CWE-305Published · Updated
Key facts
- Attack vector
- Physical
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00296 22nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Dahua | NVR2-4KS3 | Versions which Build time prior to 3rd March 2026 | — | No fix listed | CNA |
| Dahua | XVR4232AN-I/T | Versions which Build time prior to 3rd March 2026 | — | No fix listed | CNA |
| Dahua | XVR1B16H-I/T | Versions which Build time prior to 3rd March 2026 | — | No fix listed | CNA |
- NVR2-4KS3 VendorDahua Affected Versions which Build time prior to 3rd March 2026 Fixed in — No fix listed CNA
- XVR4232AN-I/T VendorDahua Affected Versions which Build time prior to 3rd March 2026 Fixed in — No fix listed CNA
- XVR1B16H-I/T VendorDahua Affected Versions which Build time prior to 3rd March 2026 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-31703
- 2026-10-03 Alias added: GHSA-26qr-26wf-xv6x
References
More Dahua vulnerabilities
- TI-2021-12646 Improper authentication in Some Dahua IP Camera, Video Intercom, NVR, XVR devices KEVCVSS 3.1CRITICAL 9.8
- TI-2021-12645 Improper authentication in Some Dahua IP Camera, Video Intercom, PTZ Dome Camera, Thermal… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-03585 Dahua Smart Park Management unrestricted upload CVSS 3.1CRITICAL 9.8
- TI-2024-12178 Dahua IPC-HFW1200S Web Interface Sha1Account1 path traversal CVSS 4.0MEDIUM 5.3
- TI-2019-02954 Missing authentication in Dahua IPC-XXBXX CVSS 3.0HIGH 7.5
- TI-2025-43987 Command injection in Dahua Intelligent Connection Center CVSS 3.1CRITICAL 9.8
Sources
- CVE-2025-31703 · CVE Program
- CVE-2025-31703 · NVD
- FIRST EPSS
- GHSA-26qr-26wf-xv6x · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences