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.
Published: 2026-02-24
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service
Action: Patch
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Thu, 16 Apr 2026 16:45:00 +0000

Type Values Removed Values Added
Title Denial of Service via Invalid U-Format Frame in IEC 60870-5-104

Sat, 28 Feb 2026 03:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 27 Feb 2026 19:00:00 +0000

Type Values Removed Values Added
First Time appeared Hitachienergy rtu520
Hitachienergy rtu520 Firmware
Hitachienergy rtu530
Hitachienergy rtu530 Firmware
Hitachienergy rtu540
Hitachienergy rtu540 Firmware
Hitachienergy rtu560
Hitachienergy rtu560 Firmware
CPEs cpe:2.3:h:hitachienergy:rtu520:-:*:*:*:*:*:*:*
cpe:2.3:h:hitachienergy:rtu530:-:*:*:*:*:*:*:*
cpe:2.3:h:hitachienergy:rtu540:-:*:*:*:*:*:*:*
cpe:2.3:h:hitachienergy:rtu560:-:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu520_firmware:13.8.1:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu530_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu530_firmware:13.8.1:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu540_firmware:13.8.1:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu560_firmware:13.8.1:*:*:*:*:*:*:*
Vendors & Products Hitachienergy rtu520
Hitachienergy rtu520 Firmware
Hitachienergy rtu530
Hitachienergy rtu530 Firmware
Hitachienergy rtu540
Hitachienergy rtu540 Firmware
Hitachienergy rtu560
Hitachienergy rtu560 Firmware
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Wed, 25 Feb 2026 12:00:00 +0000

Type Values Removed Values Added
First Time appeared Hitachienergy
Hitachienergy rtu500 Firmware
Vendors & Products Hitachienergy
Hitachienergy rtu500 Firmware

Tue, 24 Feb 2026 14:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20 CWE-184

Tue, 24 Feb 2026 13:30:00 +0000

Type Values Removed Values Added
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.
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}


Subscriptions

Hitachienergy Rtu500 Firmware Rtu520 Rtu520 Firmware Rtu530 Rtu530 Firmware Rtu540 Rtu540 Firmware Rtu560 Rtu560 Firmware
cve-icon MITRE

Status: PUBLISHED

Assigner: Hitachi Energy

Published:

Updated: 2026-02-28T02:20:00.192Z

Reserved: 2026-02-02T16:28:59.394Z

Link: CVE-2026-1773

cve-icon Vulnrichment

Updated: 2026-02-28T02:19:54.971Z

cve-icon NVD

Status : Analyzed

Published: 2026-02-24T14:16:22.420

Modified: 2026-02-27T18:56:20.460

Link: CVE-2026-1773

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-04-16T16:30:15Z

Weaknesses