Physical privilege escalation via serial authentication bypass
Published Mar 18, 2026 · Updated Mar 18, 2026
Authentication bypass in Dahua NVR2-4KS3 and XVR recorders built before March 3, 2026 allows physically proximate attackers to escalate privileges. The serial-port interface grants access to a restricted shell, whose authentication mechanism can then be bypassed; Dahua has not disclosed the underlying implementation error. Physical access to the recorder is required, and successful exploitation exposes shell access with increased privileges but no reported service interruption.
Summary
What happened
Authentication bypass in Dahua NVR2-4KS3 and XVR recorders built before March 3, 2026 allows physically proximate attackers to escalate privileges. The serial-port interface grants access to a restricted shell, whose authentication mechanism can then be bypassed; Dahua has not disclosed the underlying implementation error. Physical access to the recorder is required, and successful exploitation exposes shell access with increased privileges but no reported service interruption.
The record
- CVE
- CVE-2025-31703
- Published
- Mar 18, 2026
- Updated
- Mar 18, 2026
- Vendor
- Zhejiang Dahua Technology Co., Ltd.
- Product
- XVR4232AN-I/T
- Classifications
- CWE-305, T1068
- Attack vector
- physical
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 18, 2026CVE publishedPublication date reported by the CVE source.
- Mar 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=Versions which Build time prior to 3rd March 2026
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo