CVE-2021-27196: Hitachienergy FOX615 TEGO1 Firmware

High severity, CVSS 7.5. EPSS: 1.6% chance of exploitation in the next 30 days.

Improper Input Validation vulnerability in Hitachi ABB Power Grids Relion 670 Series, Relion 670/650 Series, Relion 670/650/SAM600-IO, Relion 650, REB500, RTU500 Series, FOX615 (TEGO1), MSM, GMS600, PWC600 allows an attacker with access to the IEC 61850 network with knowledge of how to reproduce the attack, as well as the IP addresses of the different IEC 61850 access points (of IEDs/products), to force the device to reboot, which renders the device inoperable for approximately 60 seconds. This vulnerability affects only products with IEC 61850 interfaces. This issue affects: Hitachi ABB Power Grids Relion 670 Series 1.1; 1.2.3 versions prior to 1.2.3.20; 2.0 versions prior to 2.0.0.13; 2.1; 2.2.2 versions prior to 2.2.2.3; 2.2.3 versions prior to 2.2.3.2. Hitachi ABB Power Grids Relion 670/650 Series 2.2.0 versions prior to 2.2.0.13. Hitachi ABB Power Grids Relion 670/650/SAM600-IO 2.2.1 versions prior to 2.2.1.6. Hitachi ABB Power Grids Relion 650 1.1; 1.2; 1.3 versions prior to 1.3.0.7. Hitachi ABB Power Grids REB500 7.3; 7.4; 7.5; 7.6; 8.2; 8.3. Hitachi ABB Power Grids RTU500 Series 7.x version 7.x and prior versions; 8.x version 8.x and prior versions; 9.x version 9.x and prior versions; 10.x version 10.x and prior versions; 11.x version 11.x and prior versions; 12.x version 12.x and prior versions. Hitachi ABB Power Grids FOX615 (TEGO1) R1D02 version R1D02 and prior versions. Hitachi ABB Power Grids MSM 2.1.0 versions prior to 2.1.0. Hitachi ABB Power Grids GMS600 1.3.0 version 1.3.0 and prior versions. Hitachi ABB Power Grids PWC600 1.0 versions prior to 1.0.1.4; 1.1 versions prior to 1.1.0.1.

Affected products

• Hitachienergy FOX615 TEGO1 Firmware: before r2a16 (fixed in r2a16)
• Hitachienergy GMS600 Firmware: up to and including 1.3.0
• Hitachienergy Modular Switchgear Monitoring Firmware: before 2.1.0 (fixed in 2.1.0)
• Hitachienergy PWC600 Firmware: from 1.0, before 1.0.1.4 (fixed in 1.0.1.4); from 1.1, before 1.1.0.1 (fixed in 1.1.0.1)
• Hitachienergy REB500 Firmware: from 7.3, before 7.60.19 (fixed in 7.60.19); from 8.2, before 8.2.0.5 (fixed in 8.2.0.5); from 8.3, up to and including 8.3.1.0
• Hitachienergy Relion 650 Firmware: from 1.3, before 1.3.0.7 (fixed in 1.3.0.7); from 2.2.0, before 2.2.0.13 (fixed in 2.2.0.13); from 2.2.1, before 2.2.1.6 (fixed in 2.2.1.6); version 1.1 only; version 1.2 only; version 2.1 only
• Hitachienergy Relion 670 Firmware: from 1.2.3, before 1.2.3.20 (fixed in 1.2.3.20); from 2.0, before 2.0.0.13 (fixed in 2.0.0.13); from 2.2.0, before 2.2.0.13 (fixed in 2.2.0.13); from 2.2.1, before 2.2.1.6 (fixed in 2.2.1.6); from 2.2.2, before 2.2.2.3 (fixed in 2.2.2.3); from 2.2.3, before 2.2.3.2 (fixed in 2.2.3.2); …
• Hitachienergy Relion SAM600-Io Firmware: from 2.2.1, before 2.2.1.6 (fixed in 2.2.1.6)
• Hitachienergy RTU500 Firmware: version 7.0 only; version 8.0 only; version 9.0 only; version 10.0 only; version 11.0 only; version 12.0 only

Published 2021-06-14. Last modified 2026-06-17.