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HIGH · 7.5

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 comm...

Vulnerability 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.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
HitachienergyRtu540 Firmware>= 12.7.1, <= 12.7.7
HitachienergyRtu540-
HitachienergyRtu560 Firmware>= 12.7.1, <= 12.7.7
HitachienergyRtu560-
HitachienergyRtu520 Firmware>= 12.7.1, <= 12.7.7
HitachienergyRtu520-
HitachienergyRtu530 Firmware>= 12.7.1, <= 12.7.7
HitachienergyRtu530-

Related Weaknesses (CWE)

CWE-184

References

FAQ

What is CVE-2026-1773?

CVE-2026-1773 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 comm...

How severe is CVE-2026-1773?

CVE-2026-1773 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-1773?

Check the references section above for vendor advisories and patch information. Affected products include: Hitachienergy Rtu540 Firmware, Hitachienergy Rtu540, Hitachienergy Rtu560 Firmware, Hitachienergy Rtu560, Hitachienergy Rtu520 Firmware.