CVE-2025-66176 remediation guide
Hikvision DS-K1T331, DS-K1T341A/K1T341B, DS-K1T671/K5671
There is a Buffer overflow Vulnerability in the device Search and Discovery feature of Hikvision Access Control Products. If exploited, an attacker on the same local area network (LAN) could cause the device to malfunction by sending specially crafted packets to an unpatched device.
Identify the affected asset
Confirm whether Hikvision DS-K1T331, DS-K1T341A/K1T341B, DS-K1T671/K5671 is installed, record the deployed version and installation path, and identify exposed interfaces.
- Record the product name, package or appliance identifier, and installed version.
- Identify internet-facing, administrative, API, and internal access paths.
- Preserve the pre-change configuration and relevant service logs.
Validate the affected-version match
Compare the deployed version with the affected range: Versions below V3.7.80, Versions below V3.3.180, Versions below V4.48.0, Versions below V1.4.21, Versions below V1.4.22, Versions below V1.4.23, Versions below V1.3.65, Versions below V3.25.40, Versions below V3.9.40, Versions below V4.23.41, Versions below V4.37.40, < 3.7.80, < 3.3.180, < 4.48.0, <= 1.4.21, < 1.4.22, < 1.4.23, < 1.3.65, < 3.25.40, < 3.9.40. Treat incomplete inventory results as unresolved.
Prioritize with independent signals
The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.
Apply supported remediation
Follow the vendor advisory or supported update path. Current fixed-version status: 3.7.80, 3.3.180, 4.48.0, 1.4.22, 1.4.23, 1.3.65, 3.25.40, 3.9.40, 4.23.41, 4.37.40. Preserve configuration and rollback material before change.
Verify the result
Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.
- Confirm the expected version and package state.
- Run a functional health check for critical service paths.
- Review authentication, error, application, and security monitoring logs.
- Reassess exposure if the supported fix cannot be applied.
Operational boundary
This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.