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{
"dataType": "CVE_RECORD",
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"cveMetadata": {
"cveId": "CVE-2026-1773",
"assignerOrgId": "e383dce4-0c27-4495-91c4-0db157728d17",
"state": "PUBLISHED",
"assignerShortName": "Hitachi Energy",
"dateReserved": "2026-02-02T16:28:59.394Z",
"datePublished": "2026-02-24T13:13:17.990Z",
"dateUpdated": "2026-05-27T14:50:01.447Z"
},
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"orgId": "e383dce4-0c27-4495-91c4-0db157728d17",
"shortName": "Hitachi Energy",
"dateUpdated": "2026-05-26T14:53:41.970Z"
},
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"cweId": "CWE-184",
"description": "CWE-184 Incomplete List of Disallowed Inputs",
"type": "CWE"
}
]
}
],
"impacts": [
{
"capecId": "CAPEC-278",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-278 Web Services Protocol Manipulation"
}
]
}
],
"affected": [
{
"vendor": "Hitachi Energy",
"product": "RTU500 series CMU firmware",
"versions": [
{
"status": "affected",
"version": "12.7.1",
"lessThanOrEqual": "12.7.7",
"versionType": "custom"
},
{
"status": "affected",
"version": "13.5.1",
"lessThanOrEqual": "13.5.4",
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"status": "affected",
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"lessThanOrEqual": "13.6.2",
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"status": "affected",
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"defaultStatus": "unaffected"
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"descriptions": [
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"lang": "en",
"value": "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.",
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"value": "IEC 60870-5-104 used in RTU500: Potential Denial of Service impact on reception of invalid U-format frame.&nbsp;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.<br>"
}
]
}
],
"references": [
{
"url": "https://publisher.hitachienergy.com/preview?DocumentID=8DBD000237&LanguageCode=en&DocumentPartId=&Action=Launch"
}
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"format": "CVSS",
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"value": "GENERAL"
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"cvssV4_0": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"privilegesRequired": "NONE",
"userInteraction": "NONE",
"vulnConfidentialityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"subIntegrityImpact": "NONE",
"vulnAvailabilityImpact": "HIGH",
"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED",
"version": "4.0",
"baseSeverity": "HIGH",
"baseScore": 8.7,
"vectorString": "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"
}
}
],
"source": {
"discovery": "UNKNOWN"
},
"x_generator": {
"engine": "Vulnogram 0.5.0"
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"adp": [
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"metrics": [
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"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-02-28T02:19:44.432868Z",
"id": "CVE-2026-1773",
"options": [
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"Exploitation": "none"
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"Automatable": "yes"
},
{
"Technical Impact": "partial"
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],
"role": "CISA Coordinator",
"version": "2.0.3"
}
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],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-05-27T14:50:01.447Z"
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