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CVE-2025-66176

8.8
High
EPSS 0.47%Patch availableJan 13, 2026

Stack overflow in Hikvision access control Search/Discovery allows LAN crash.

common questions

Is CVE-2025-66176 being exploited?

Not confirmed. CVE-2025-66176 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.47% probability of exploitation in the next 30 days.

How severe is CVE-2025-66176?

CVE-2025-66176 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2025-66176?

Yes. A fix has been recorded for CVE-2025-66176. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2025-66176 affect?

CVE-2025-66176 affects Hikvision Access Control devices, Search and Discovery feature. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2025-66176?

Monitor devices; apply firmware update when released; restrict LAN access.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Hikvision Access Control devicesSearch and Discovery feature
impact

LAN-based buffer overflow can crash/malfunction the device, causing denial of service.

action required

Patch when possible

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

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
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