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CVE-2026-1773

Quick assessment

Affected
Hitachi Energy RTU500 series CMU firmware
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Hitachi Energy RTU500是日本日立制作所（Hitachi）公司的一系列工控组件。 Hitachi Energy RTU500存在安全漏洞，该漏洞源于接收无效U格式帧可能导致拒绝服务。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 5

VendorProduct Version RangeStatus
Hitachi Energy RTU500 series CMU firmware 12.7.1≤ 12.7.7 affected
13.5.1≤ 13.5.4 affected
13.6.1≤ 13.6.2 affected
13.7.1≤ 13.7.7 affected
13.8.1 affected
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I. Basic Information for CVE-2026-1773

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
不完整的黑名单
Source: CVE Program / CVE List V5
Vulnerability Title
Hitachi Energy RTU500 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hitachi Energy RTU500是日本日立制作所（Hitachi）公司的一系列工控组件。 Hitachi Energy RTU500存在安全漏洞，该漏洞源于接收无效U格式帧可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Hitachi Energy RTU500 series CMU firmware 12.7.1 ~ 12.7.7 -

II. Public POCs for CVE-2026-1773

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III. Intelligence Information for CVE-2026-1773

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Same Patch Batch · Hitachi Energy · 2026-02-24 · 4 CVEs total

CVE-2026-1772 Hitachi Energy RTU500 安全漏洞
CVE-2026-2460 Hitachi Energy Relion REB500 安全漏洞
CVE-2026-2459 Hitachi Energy Relion REB500 安全漏洞

IV. Related Vulnerabilities

Same product: RTU500 series CMU firmware
Same vendor: Hitachi Energy
Same weakness: CWE-184

V. Comments for CVE-2026-1773

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