CVE-2026-1773

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Summary

CVECVE-2026-1773
StatePUBLISHED
AssignerHitachi Energy
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-24 14:16:22 UTC
Updated2026-05-26 16:16:22 UTC
DescriptionIEC 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.

Risk And Classification

Primary CVSS: v4.0 8.7 HIGH from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.000260000 probability, percentile 0.080590000 (date 2026-05-28)

Problem Types: CWE-184 | CWE-184 CWE-184 Incomplete List of Disallowed Inputs

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/C...
4.0CNACVSS8.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Hardware Hitachienergy Rtu520 - All All All
Operating System Hitachienergy Rtu520 Firmware All All All All
Operating System Hitachienergy Rtu520 Firmware 13.8.1 All All All
Operating System Hitachienergy Rtu520 Firmware All All All All
Operating System Hitachienergy Rtu520 Firmware All All All All
Operating System Hitachienergy Rtu520 Firmware All All All All
Hardware Hitachienergy Rtu530 - All All All
Operating System Hitachienergy Rtu530 Firmware All All All All
Operating System Hitachienergy Rtu530 Firmware 13.8.1 All All All
Operating System Hitachienergy Rtu530 Firmware All All All All
Operating System Hitachienergy Rtu530 Firmware All All All All
Operating System Hitachienergy Rtu530 Firmware All All All All
Hardware Hitachienergy Rtu540 - All All All
Operating System Hitachienergy Rtu540 Firmware All All All All
Operating System Hitachienergy Rtu540 Firmware 13.8.1 All All All
Operating System Hitachienergy Rtu540 Firmware All All All All
Operating System Hitachienergy Rtu540 Firmware All All All All
Operating System Hitachienergy Rtu540 Firmware All All All All
Hardware Hitachienergy Rtu560 - All All All
Operating System Hitachienergy Rtu560 Firmware All All All All
Operating System Hitachienergy Rtu560 Firmware 13.8.1 All All All
Operating System Hitachienergy Rtu560 Firmware All All All All
Operating System Hitachienergy Rtu560 Firmware All All All All
Operating System Hitachienergy Rtu560 Firmware All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Hitachi Energy RTU500 Series CMU Firmware affected 12.7.1 12.7.7 custom Not specified
CNA Hitachi Energy RTU500 Series CMU Firmware affected 13.5.1 13.5.4 custom Not specified
CNA Hitachi Energy RTU500 Series CMU Firmware affected 13.6.1 13.6.2 custom Not specified
CNA Hitachi Energy RTU500 Series CMU Firmware affected 13.7.1 13.7.7 custom Not specified
CNA Hitachi Energy RTU500 Series CMU Firmware affected 13.8.1 custom Not specified

References

ReferenceSourceLinkTags
publisher.hitachienergy.com/preview [email protected] publisher.hitachienergy.com Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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