Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-1773

Severity CVSS v4.0:
HIGH
Type:
Unavailable / Other
Publication date:
24/02/2026
Last modified:
27/02/2026

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.

Impact

Vector 4.0
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 CVSS v4.0 Severity and Metrics:

Base Score: 8.70 HIGH
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

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): None
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): None
Integrity (VI): None
Availability (VA): High
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
8.70
Severity 4.0
HIGH
Vector 3.x
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
7.50
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:* 12.7.1 (including) 12.7.7 (including)
cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:* 13.5.1 (including) 13.5.4 (including)
cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:* 13.6.1 (including) 13.6.2 (including)
cpe:2.3:o:hitachienergy:rtu540_firmware:*:*:*:*:*:*:*:* 13.7.1 (including) 13.7.8 (excluding)
cpe:2.3:o:hitachienergy:rtu540_firmware:13.8.1:*:*:*:*:*:*:*
cpe:2.3:h:hitachienergy:rtu540:-:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:* 12.7.1 (including) 12.7.7 (including)
cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:* 13.5.1 (including) 13.5.4 (including)
cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:* 13.6.1 (including) 13.6.2 (including)
cpe:2.3:o:hitachienergy:rtu560_firmware:*:*:*:*:*:*:*:* 13.7.1 (including) 13.7.8 (excluding)
cpe:2.3:o:hitachienergy:rtu560_firmware:13.8.1:*:*:*:*:*:*:*
cpe:2.3:h:hitachienergy:rtu560:-:*:*:*:*:*:*:*
cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:* 12.7.1 (including) 12.7.7 (including)
cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:* 13.5.1 (including) 13.5.4 (including)
cpe:2.3:o:hitachienergy:rtu520_firmware:*:*:*:*:*:*:*:* 13.6.1 (including) 13.6.2 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools