Detections
Analytics

Hitachi Energy RTU500 Product Incomplete List of Disallowed Inputs (CVE-2026-1773)

high Tenable OT Security Plugin ID 505207

Synopsis

The remote OT asset is affected by a vulnerability.

Description

IEC 60870-5-104: Potential Denial of Service impact on reception of invalid U-format frame. Product is only affected if IEC 60870-5-104 bi-directional functionality is configured. Enabling secure communication following IEC 62351-3 does not remediate the vulnerability but mitigates the risk of exploitation.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original can be found at CISA.gov.

See Also

http://www.nessus.org/u?c424473c

https://www.cisa.gov/news-events/ics-advisories/icsa-26-062-03

Plugin Details

Severity: High

ID: 505207

File Name: tenable_ot_abb_CVE-2026-1773.nasl

Version: 1.4

Type: remote

Family: Tenable.ot

Published: 3/4/2026

Updated: 3/10/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-1773

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS v4

Risk Factor: High

Base Score: 8.7

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:hitachienergy:rtu540_firmware:13.8.1, cpe:/o:hitachienergy:rtu560_firmware:12, cpe:/o:hitachienergy:rtu530_firmware:13.8.1, cpe:/o:hitachienergy:rtu520_firmware:13.8.1, cpe:/o:hitachienergy:rtu540_firmware:12, cpe:/o:hitachienergy:rtu520_firmware:12, cpe:/o:hitachienergy:rtu520_firmware:13, cpe:/o:hitachienergy:rtu540_firmware:13, cpe:/o:hitachienergy:rtu560_firmware:13, cpe:/o:hitachienergy:rtu530_firmware:12, cpe:/o:hitachienergy:rtu560_firmware:13.8.1, cpe:/o:hitachienergy:rtu530_firmware:13

Required KB Items: Tenable.ot/ABB

Exploit Ease: No known exploits are available

Patch Publication Date: 2/24/2026

Vulnerability Publication Date: 2/24/2026

Reference Information

CVE: CVE-2026-1773

CWE: 184

ICSA: 26-062-03