Hitachienergy REB500 Firmware vulnerabilities

4 CVEs affecting Hitachienergy REB500 Firmware, 0 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2026-2460, published 2026-02-24.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2021-27196, published 2021-06-14. 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,…
CVE-2022-3353, published 2023-02-21. High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days. A vulnerability exists in the IEC 61850 communication stack that affects multiple Hitachi Energy products. An attacker could exploit the vulnerability by using a specially crafted message…
CVE-2026-2459, published 2026-02-24. High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days. A vulnerability exists in REB500 for an authenticated user with Installer role to access and alter the contents of directories that the role is not authorized to do so.
CVE-2026-2460, published 2026-02-24. High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days. A vulnerability exists in REB500 for an authenticated user with low-level privileges to access and alter the content of directories by using the DAC protocol that the user is not authorized to do so.