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8.7
IEC 60870-5-104: Invalid Frame Can Crash System
CVE-2026-1773
Summary
A specific type of data packet can potentially crash the system if it's configured to receive IEC 60870-5-104 data from both to and from the system. This could disrupt normal operation and affect reliability. To minimize the risk, ensure secure communication is enabled as per IEC 62351-3 standards.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| hitachienergy | rtu540_firmware | > 12.7.1 , <= 12.7.7 | – |
| hitachienergy | rtu540_firmware | > 13.5.1 , <= 13.5.4 | – |
| hitachienergy | rtu540_firmware | > 13.6.1 , <= 13.6.2 | – |
| hitachienergy | rtu540_firmware | > 13.7.1 , <= 13.7.8 | – |
| hitachienergy | rtu540_firmware | 13.8.1 | – |
| hitachienergy | rtu560_firmware | > 12.7.1 , <= 12.7.7 | – |
| hitachienergy | rtu560_firmware | > 13.5.1 , <= 13.5.4 | – |
| hitachienergy | rtu560_firmware | > 13.6.1 , <= 13.6.2 | – |
| hitachienergy | rtu560_firmware | > 13.7.1 , <= 13.7.8 | – |
| hitachienergy | rtu560_firmware | 13.8.1 | – |
| hitachienergy | rtu520_firmware | > 12.7.1 , <= 12.7.7 | – |
| hitachienergy | rtu520_firmware | > 13.5.1 , <= 13.5.4 | – |
| hitachienergy | rtu520_firmware | > 13.6.1 , <= 13.6.2 | – |
| hitachienergy | rtu520_firmware | > 13.7.1 , <= 13.7.8 | – |
| hitachienergy | rtu520_firmware | 13.8.1 | – |
| hitachienergy | rtu530_firmware | > 12.7.1 , <= 12.7.7 | – |
| hitachienergy | rtu530_firmware | > 13.5.1 , <= 13.5.4 | – |
| hitachienergy | rtu530_firmware | > 13.6.1 , <= 13.6.2 | – |
| hitachienergy | rtu530_firmware | > 13.7.1 , <= 13.7.8 | – |
| hitachienergy | rtu530_firmware | 13.8.1 | – |
Original title
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 c...
Original 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.
nvd CVSS3.1
7.5
nvd CVSS4.0
8.7
Vulnerability type
CWE-184
Published: 24 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026