Review reviewHigh

CVE-2025-66176

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.

CVSS
8.8
EPSS
0.48%
39.2% percentile
CISA KEV
Not listed
Published
2026.01.13
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.48%
Technical severityCVSS 8.8

Vulnerability overview

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.

Affected product and versions

Product
Hikvision DS-K1T331, DS-K1T341A/K1T341B, DS-K1T671/K5671
Affected versions
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
Fixed versions
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

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Hikvision DS-K1T331, DS-K1T341A/K1T341B, DS-K1T671/K5671 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-121
CVE-2025-66176 — Hikvision DS-K1T331, DS-K1T341A/K1T341B, DS-K1T671/K5671 | SECUFOCUS NOW