Detections
Analytics
Uniview IP Cameras Classic Buffer Overflow (CVE-2021-45039)
critical Tenable OT Security Plugin ID 506028
Synopsis
The remote OT asset is affected by a vulnerability.Description
Multiple models of the Uniview IP Camera offer an undocumented UDP service on port 7788 that allows a remote, unauthenticated attacker to overflow an internal buffer and achieve code execution.By using this buffer overflow, a remote attacker can start the telnetd service. This service has a hardcoded default username and password.
Although it has a restrictive shell, this can be easily bypassed via the built-in ECHO shell command.
This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
Upgrade the device to the fixed firmware build for its release branch, as listed in Uniview security notice USRC-202112-01.The vendor also notes that exploitation requires reaching UDP port 7788 on the device. Ensure that port is not mapped to the Internet (WAN) by a router or firewall, do not configure the device as a DMZ host, and do not configure a full cone NAT.
See Also
https://ssd-disclosure.com/ssd-advisory--uniview-preauth-rce/
Plugin Details
Severity: Critical
ID: 506028
File Name: tenable_ot_uniview_CVE-2021-45039.nasl
Version: 1.1
Type: Remote
Family: Tenable.ot
Published: 10/2/2026
Updated: 10/2/2026
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Medium
Score: 4.9
Percentile: 57.15
CVSS v3
Risk Factor: Critical
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability Information
CPE: cpe:/o:uniview:camera_firmware
Required KB Items: Tenable.ot/Uniview
Patch Publication Date: 12/22/2021
Vulnerability Publication Date: 12/22/2021
Reference Information
CVE: CVE-2021-45039
CWE: 120