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CVE-2026-1773

HIGH
7.5
CVSS Score
Published: February 24, 2026 at 01:13 PM UTC
Updated: June 17, 2026 at 10:16 AM UTC
5 products affected across 1 vendorRTU520 FirmwareRTU530 FirmwareRTU540 Firmware

Using RTU500 series CMU firmware by Hitachi Energy?

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Severity
HIGH7.5
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

RTU520 Firmware· Hitachi Energy
95%
12.7.1 ≤ v ≤ 12.7.713.5.1 ≤ v ≤ 13.5.413.6.1 ≤ v ≤ 13.6.213.7.1 ≤ v < 13.7.813.8.1
hitachienergy-rtu520 (same device)
RTU530 Firmware· Hitachi Energy
95%
12.7.1 ≤ v ≤ 12.7.713.5.1 ≤ v ≤ 13.5.413.6.1 ≤ v ≤ 13.6.213.7.1 ≤ v < 13.7.813.8.1
hitachienergy-rtu530 (same device)
RTU540 Firmware· Hitachi Energy
95%
12.7.1 ≤ v ≤ 12.7.713.5.1 ≤ v ≤ 13.5.413.6.1 ≤ v ≤ 13.6.213.7.1 ≤ v < 13.7.813.8.1
hitachienergy-rtu540 (same device)
RTU560 Firmware· Hitachi Energy
95%
12.7.1 ≤ v ≤ 12.7.713.5.1 ≤ v ≤ 13.5.413.6.1 ≤ v ≤ 13.6.213.7.1 ≤ v < 13.7.813.8.1
hitachienergy-rtu560 (same device)
RTU500· Hitachi Energy
60%
12.7.1 ≤ v ≤ 12.7.713.5.1 ≤ v ≤ 13.5.413.6.1 ≤ v ≤ 13.6.213.7.1 ≤ v ≤ 13.7.712.7.113.5.113.6.113.7.113.8.1

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://publisher.hitachienergy.com/preview?DocumentID=8DBD000237&LanguageCode=en&DocumentPartId=&Action=Launch

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-184

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