Tridium Niagara Improper Authentication (CVE-2017-16748)

critical Tenable OT Security Plugin ID 500895


The remote OT asset is affected by a vulnerability.


An attacker can log into the local Niagara platform (Niagara AX Framework Versions 3.8 and prior or Niagara 4 Framework Versions 4.4 and prior) using a disabled account name and a blank password, granting the attacker administrator access to the Niagara system.

This plugin only works with Tenable.ot.
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The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at

Tridium has recommended the following mitigation:

- Niagara AX v3.8: Apply Update 4 release (3.8.401), and
- Niagara 4 Framework v4.4: Apply Update 1 release (

For more information about these updates, please refer to the provided link: a=en

See Also

Plugin Details

Severity: Critical

ID: 500895

Version: 1.8

Type: remote

Family: Tenable.ot

Published: 3/21/2023

Updated: 3/4/2024

Supported Sensors: Tenable OT Security

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2017-16748


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:tridium:niagara, cpe:/a:tridium:niagara_ax_framework

Required KB Items: Tenable.ot/assetBag

Exploit Ease: No known exploits are available

Patch Publication Date: 8/20/2018

Vulnerability Publication Date: 8/20/2018

Reference Information

CVE: CVE-2017-16748

CWE: 287