CVE-2026-1773

Published Feb 24, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Title Denial of Service via Invalid U-Format Frame in IEC 60870-5-104
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. 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.
Type Values Removed Values Added
Title Denial of Service via Invalid U-Format Frame in IEC 60870-5-104
Type Values Removed Values Added
Metrics ssvc

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

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'}

Type Values Removed Values Added
First Time appeared Hitachienergy
Hitachienergy rtu500 Firmware
Vendors & Products Hitachienergy
Hitachienergy rtu500 Firmware
Type Values Removed Values Added
Weaknesses CWE-20 CWE-184
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Hitachi Energy
Published
Updated
May 27, 2026, 2:50 PM
Reserved
Feb 2, 2026, 4:28 PM
Status
Modified
Published
Feb 24, 2026, 2:16 PM
Modified
Jun 17, 2026, 10:16 AM