Published

19 December 2025

Last modified

17 June 2026

CVSS

6.2 v3.1

Severity

medium

EPSS

0.2% (12th pct)

CISA KEV

Not listed

NVD status

Analyzed

Weaknesses

CWE-269

CVSS:3.1/AV:P/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Description

There is a privilege escalation vulnerability in some Hikvision DVR products. Due to the improper implementation of authentication for the serial port, an attacker with physical access could exploit this vulnerability by connecting to the affected products and gaining access to an unrestricted shell environment.

Exploitation

Not listed in the CISA Known Exploited Vulnerabilities catalogue as of 2026.09.04. That is an absence of confirmed public exploitation, not evidence that exploitation has not occurred. EPSS models a 0.2% probability of exploitation activity in the next 30 days.

Affected products

References

Vendor advisory and patch

• https://www.hikvision.com/en/support/cybersecurity/security-advisory/serial-port-privilege-escalation-vulnerabilities-in-some-hikvision-nvr-devices/

CVE-2025-66173 at NVD

Record assembled from NVD, CISA KEV 2026.09.04 and FIRST EPSS 2026-09-04. Affected products are those NVD's CPE configuration names that fall inside this site's scope; a CVE may affect products outside it.