CVE-2026-17539

RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.

CVSS v3 5.9 MEDIUM

5.9^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259&LanguageCode=en&DocumentPartId=&Action=Launch

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-03 13:04

Updated : 2026-09-03 16:43

NVD link : CVE-2026-17539

Mitre link : CVE-2026-17539

CVE.ORG link : CVE-2026-17539

JSON object : View

Products Affected

No product.

CWE

CWE-476

NULL Pointer Dereference

{"id": "CVE-2026-17539", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-17539", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-03T12:47:58.284424Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "cybersecurity@hitachienergy.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.2}]}, "affected": [{"source": "cybersecurity@hitachienergy.com", "affectedData": [{"vendor": "Hitachi Energy", "product": "RTU500 series CMU firmware", "versions": [{"status": "affected", "version": "12.7.1", "versionType": "custom", "lessThanOrEqual": "12.7.7"}, {"status": "affected", "version": "13.5.1", "versionType": "custom", "lessThanOrEqual": "13.5.4"}, {"status": "affected", "version": "13.6.1", "versionType": "custom", "lessThanOrEqual": "13.6.3"}, {"status": "affected", "version": "13.7.1", "versionType": "custom", "lessThanOrEqual": "13.7.8"}, {"status": "affected", "version": "13.8.1", "versionType": "custom", "lessThanOrEqual": "13.8.2"}], "defaultStatus": "unaffected"}]}], "published": "2026-09-03T13:04:35.693", "references": [{"url": "https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259&LanguageCode=en&DocumentPartId=&Action=Launch", "source": "cybersecurity@hitachienergy.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Primary", "source": "cybersecurity@hitachienergy.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication."}], "lastModified": "2026-09-03T16:43:15.293", "sourceIdentifier": "cybersecurity@hitachienergy.com"}