IM
IronMonkey Threat Research

CVE-2026-1773 HIGH

Published: 2026-02-24 | Last Modified: 2026-05-26 | Status: Modified

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.

Additional Descriptions (1)

IEC 60870-5-104: Hay un potencial impacto de denegación de servicio en la recepción de una trama de formato U inválida. El producto solo se ve afectado si está configurada la funcionalidad bidireccional IEC 60870-5-104. Si se habilita la comunicación segura siguiendo la IEC 62351-3 no se remedia la vulnerabilidad, pero se mitiga el riesgo de explotación.

CVSS Metrics

Base Score: 7.5 (HIGH)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNETWORK
Attack ComplexityLOW
Privileges RequiredNONE
User InteractionNONE
ScopeUNCHANGED
Confidentiality ImpactNONE
Integrity ImpactNONE
Availability ImpactHIGH

Source: [email protected]

Type: Primary

Exploitability Score: 3.9

Impact Score: 3.6

Base Score: 8.7 (HIGH)

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack VectorNETWORK
Attack ComplexityLOW
Attack RequirementsNONE
Privileges RequiredNONE
User InteractionNONE
Vulnerability ConfidentialityNONE
Vulnerability IntegrityNONE
Vulnerability AvailabilityHIGH
Subsequent ConfidentialityNONE
Subsequent IntegrityNONE
Subsequent AvailabilityNONE

Source: [email protected]

Type: Secondary

Weaknesses

Source Type Description
[email protected] Secondary
en CWE-184

Affected Products

Vendor Product Version Update Type
hitachienergy rtu540_firmware * <built-in method update of dict object at 0x72a9cd0c0f00> Operating System
hitachienergy rtu540_firmware * <built-in method update of dict object at 0x72a9b0db6940> Operating System
hitachienergy rtu540_firmware * <built-in method update of dict object at 0x72a9b0db67c0> Operating System
hitachienergy rtu540_firmware * <built-in method update of dict object at 0x72a9cc41ce00> Operating System
hitachienergy rtu540_firmware 13.8.1 <built-in method update of dict object at 0x72a9cd0c2300> Operating System
hitachienergy rtu560_firmware * <built-in method update of dict object at 0x72a9cd0c1100> Operating System
hitachienergy rtu560_firmware * <built-in method update of dict object at 0x72a9b0db5140> Operating System
hitachienergy rtu560_firmware * <built-in method update of dict object at 0x72a9cd0c0f40> Operating System
hitachienergy rtu560_firmware * <built-in method update of dict object at 0x72a9b0db57c0> Operating System
hitachienergy rtu560_firmware 13.8.1 <built-in method update of dict object at 0x72a9cd0c19c0> Operating System
hitachienergy rtu520_firmware * <built-in method update of dict object at 0x72a9cd0c2440> Operating System
hitachienergy rtu520_firmware * <built-in method update of dict object at 0x72a9b0db4840> Operating System
hitachienergy rtu520_firmware * <built-in method update of dict object at 0x72a9cc46e0c0> Operating System
hitachienergy rtu520_firmware * <built-in method update of dict object at 0x72a9cd0c1a00> Operating System
hitachienergy rtu520_firmware 13.8.1 <built-in method update of dict object at 0x72a9cc46dfc0> Operating System
hitachienergy rtu530_firmware * <built-in method update of dict object at 0x72a9cc41ec00> Operating System
hitachienergy rtu530_firmware * <built-in method update of dict object at 0x72a9cd0c1dc0> Operating System
hitachienergy rtu530_firmware * <built-in method update of dict object at 0x72a9b0db70c0> Operating System
hitachienergy rtu530_firmware * <built-in method update of dict object at 0x72a9b0db5380> Operating System
hitachienergy rtu530_firmware 13.8.1 <built-in method update of dict object at 0x72a9b0c3fd00> Operating System

Affected Configurations

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu540_firmware:13.8.1:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
No cpe:2.3:h:hitachienergy:rtu540:-:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu560_firmware:13.8.1:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
No cpe:2.3:h:hitachienergy:rtu560:-:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu520_firmware:13.8.1:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
No cpe:2.3:h:hitachienergy:rtu520:-:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
Yes cpe:2.3:o:hitachienergy:rtu530_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu530_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu530_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu530_firmware:*:*:*:*:*:*:*:*
Yes cpe:2.3:o:hitachienergy:rtu530_firmware:13.8.1:*:*:*:*:*:*:*

Operator: OR

Vulnerable CPE
No cpe:2.3:h:hitachienergy:rtu530:-:*:*:*:*:*:*:*
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