Vulnerability Details CVE-2026-1773
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 22.0%
CVSS Severity
CVSS v3 Score 7.5
Products affected by CVE-2026-1773
-
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:12.7.1
-
cpe:2.3:o:hitachienergy:rtu520_firmware:12.7.6
-
cpe:2.3:o:hitachienergy:rtu520_firmware:13.8.1
-
cpe:2.3:o:hitachienergy:rtu530_firmware:*
-
cpe:2.3:o:hitachienergy:rtu530_firmware:12.7.1
-
cpe:2.3:o:hitachienergy:rtu530_firmware:12.7.6
-
cpe:2.3:o:hitachienergy:rtu530_firmware:13.8.1
-
cpe:2.3:o:hitachienergy:rtu540_firmware:*
-
cpe:2.3:o:hitachienergy:rtu540_firmware:12.7.1
-
cpe:2.3:o:hitachienergy:rtu540_firmware:12.7.6
-
cpe:2.3:o:hitachienergy:rtu540_firmware:13.8.1
-
cpe:2.3:o:hitachienergy:rtu560_firmware:*
-
cpe:2.3:o:hitachienergy:rtu560_firmware:12.7.1
-
cpe:2.3:o:hitachienergy:rtu560_firmware:12.7.6
-
cpe:2.3:o:hitachienergy:rtu560_firmware:13.8.1