What’s Vulnerable › Vulnerabilities
CVE-2026-1773
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-02-24 · updated 2026-06-17
- Weakness: CWE-184
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.
Affected products
- Hitachienergy Rtu520 Firmware: from 12.7.1 through 12.7.7; from 13.5.1 through 13.5.4; from 13.6.1 through 13.6.2; from 13.7.1 before 13.7.8; 13.8.1 — fixed in 13.7.8
- Hitachienergy Rtu530 Firmware: from 12.7.1 through 12.7.7; from 13.5.1 through 13.5.4; from 13.6.1 through 13.6.2; from 13.7.1 before 13.7.8; 13.8.1 — fixed in 13.7.8
- Hitachienergy Rtu540 Firmware: from 12.7.1 through 12.7.7; from 13.5.1 through 13.5.4; from 13.6.1 through 13.6.2; from 13.7.1 before 13.7.8; 13.8.1 — fixed in 13.7.8
- Hitachienergy Rtu560 Firmware: from 12.7.1 through 12.7.7; from 13.5.1 through 13.5.4; from 13.6.1 through 13.6.2; from 13.7.1 before 13.7.8; 13.8.1 — fixed in 13.7.8
How to fix
Upgrade to a fixed version: Hitachienergy Rtu520 Firmware 13.7.8; Hitachienergy Rtu530 Firmware 13.7.8; Hitachienergy Rtu540 Firmware 13.7.8; Hitachienergy Rtu560 Firmware 13.7.8. Check the vendor advisory for mitigations.
References
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