Tridium Niagara Synchronous Access of Remote Resource Without Timeout (CVE-2020-14483)

medium Tenable OT Security Plugin ID 500893


The remote OT asset is affected by a vulnerability.


A timeout during a TLS handshake can result in the connection failing to terminate. This can result in a Niagara thread hanging and requires a manual restart of Niagara (Versions,,, and Niagara Enterprise Security (Versions 2.4.31, 2.4.45, to correct.

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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 released updates that mitigate this vulnerability and recommends users update to the versions identified below:

- Niagara
- Niagara Enterprise Security

Updates are available by contacting the sales support channel or by contacting the Tridium support team at [email protected]

All Tridium Niagara users for all supported platforms are encouraged to update their systems with these releases to mitigate risk. For further guidance, please contact a Tridium account manager or Customer Support.

In addition to updating to the latest version, Tridium recommends users with affected products take the following steps:

- Review and validate the list of authorized users who can authenticate to Niagara.
- Allow only trained and trusted persons to have physical access to the system, including devices with connection to the system though the Ethernet port.
- If remote connections to the network are required, consider using a VPN or other means to ensure secure remote connections into the network.

For more information please refer to Security Bulletin SB 2020-Tridium-2.

See Also

Plugin Details

Severity: Medium

ID: 500893

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: Low

Score: 1.4


Risk Factor: Low

Base Score: 3.3

Temporal Score: 2.4

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

CVSS Score Source: CVE-2020-14483


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.8

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

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

Vulnerability Information

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

Required KB Items: Tenable.ot/assetBag

Exploit Ease: No known exploits are available

Patch Publication Date: 8/13/2020

Vulnerability Publication Date: 8/13/2020

Reference Information

CVE: CVE-2020-14483