CVE-2026-8066
Hitachi Energy RTU500 series CMU firmware
- Hitachi Energy RTU500 series CMU firmware
- Critical
- CVSS 9.1
- EPSS 0.74%
- Fixed version listed
What to do
Fixed version listed
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| Hitachi Energy RTU500 series CMU firmware | from 9.0, before 12.0 | 12.0 |
Scores and signals
- Exploitation
- No known exploitation
- Severity
- Critical, CVSS 9.1 (v3.1, scored by Hitachi Energy)
- EPSS
- 0.74% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 26, 2026)
- CISA's SSVC decision points
- Exploitation: none. Automatable: yes. Technical impact: partial. As of Sep 29, 2026.
- Weakness
- CWE-23: Relative path traversal
- Vendor
- Hitachi Energy, RTU500 series CMU firmware
Timeline
- First listed as critical by cve.now. Affected and fixed versions come from the CVE record, once one is published.