{"id":"CVE-2026-1773","aliases":["EUVD-2026-8462","GHSA-q2vg-xgjr-32v3"],"status":"published","title":"IEC 60870-5-104: Potential Denial of Service impact on reception of invalid U-format frame....","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.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00453,"percentile":0.39603,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-184"],"published":"2026-02-24T13:13:17Z","modified":"2026-06-17T10:16:29Z","products":[{"vendor":"hitachi energy","product":"rtu500 series cmu firmware"},{"vendor":"hitachienergy","product":"rtu520_firmware"},{"vendor":"hitachienergy","product":"rtu530_firmware"},{"vendor":"hitachienergy","product":"rtu540_firmware"},{"vendor":"hitachienergy","product":"rtu560_firmware"}],"references":[{"url":"https://publisher.hitachienergy.com/preview?DocumentID=8DBD000237\u0026LanguageCode=en\u0026DocumentPartId=\u0026Action=Launch","tags":["Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-1773"},{"url":"https://github.com/advisories/GHSA-q2vg-xgjr-32v3"}],"sources":{"cve":[{"id":"CVE-2026-1773","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.","status":"published","published":"2026-02-24T13:13:17.99Z","modified":"2026-05-27T14:50:01.447Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"}],"cwes":["CWE-184"],"updated_at":"2026-11-02T14:20:01.271368Z"}],"euvd":[{"id":"EUVD-2026-8462","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.","status":"published","published":"2026-02-24T13:13:17Z","modified":"2026-05-27T14:50:01Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T18:21:04.415835Z"}],"ghsa":[{"id":"GHSA-q2vg-xgjr-32v3","title":"IEC 60870-5-104: Potential Denial of Service impact on reception of invalid U-format frame....","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.","status":"published","published":"2026-02-24T15:30:30Z","modified":"2026-02-27T21:32:22Z","cvss":[{"version":"4.0","score":8.7,"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/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","level":"high"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-184"],"updated_at":"2026-11-02T15:06:25.269236Z"}],"nvd":[{"id":"CVE-2026-1773","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.","status":"published","published":"2026-02-24T14:16:22.42Z","modified":"2026-06-17T10:16:29.673Z","cvss":[{"version":"4.0","score":8.7,"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/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","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-184"],"updated_at":"2026-11-02T14:12:06.63895Z"}]}}