Vulnerability Intelligence Report
CVE-2026-1773
IEC 60870-5-104 used in RTU500: 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.
No Active Exploit Signals
CVSS Base Score
8.7
HIGH
EPSS Probability:0.41%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-184 ↗CWE-184 Incomplete List of Disallowed Inputs
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| Hitachi Energy | RTU500 series CMU firmware | 12.7.1 <= 12.7.7 (affected), 13.5.1 <= 13.5.4 (affected), 13.6.1 <= 13.6.2 (affected), 13.7.1 <= 13.7.7 (affected), 13.8.1 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.411%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | Hitachi Energy |
| Reserved | 2026-02-02T16:28:59 |
| Published | 2026-02-24T13:13:17 |
| Last Updated | 2026-05-27T14:50:01 |
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