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CVE-2026-17539

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 RTU500是日本Hitachi公司的一款远程终端单元。 Hitachi RTU500 12.7.1版本至12.7.7版本、13.5.1版本至13.5.4版本、13.6.1版本至13.6.3版本、13.7.1版本至13.7.8版本和13.8.1版本至13.8.2版本存在异常处理不当漏洞，该漏洞源于高负载场景下短时间间隔发送GI请求可能导致增强消息队列最后一项出现空指针取消引用，引发BCI_IEC104致命写入错误，导致连接中断和重启，最终造成双向IEC 60870-5-104通信拒绝服务。

CVSS 5.9 · Medium EPSS 0.37% · P30

Possible ATT&CK Techniques 1 AI

T1014 · Rootkit

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≤ 13.6.3 affected
13.7.1≤ 13.7.8 affected
13.8.1≤ 13.8.2 affected
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I. Basic Information for CVE-2026-17539

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short intervals, may cause a NULL pointer dereference in the last entry of the enhanced message queue. This can cause a BCI_IEC104 fatal write error, resulting in connection interruption and restart, and ultimately a denial of service for bidirectional IEC 60870-5-104 communication.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Hitachi RTU500 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hitachi RTU500是日本Hitachi公司的一款远程终端单元。 Hitachi RTU500 12.7.1版本至12.7.7版本、13.5.1版本至13.5.4版本、13.6.1版本至13.6.3版本、13.7.1版本至13.7.8版本和13.8.1版本至13.8.2版本存在异常处理不当漏洞，该漏洞源于高负载场景下短时间间隔发送GI请求可能导致增强消息队列最后一项出现空指针取消引用，引发BCI_IEC104致命写入错误，导致连接中断和重启，最终造成双向IEC 60870-5-104通信拒绝服务。
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-2026-17539

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III. Intelligence Information for CVE-2026-17539

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Vendor Advisories for CVE-2026-17539 (1)

Same Patch Batch · Hitachi Energy · 2026-09-03 · 4 CVEs total

CVE-2026-9854 8.5 HIGH Hitachi SYS600 授权问题漏洞
CVE-2026-9853 8.5 HIGH Hitachi SYS600 授权问题漏洞
CVE-2026-9852 4.6 MEDIUM Hitachi SYS600 输入验证错误漏洞

IV. Related Vulnerabilities

Same product: RTU500 series CMU firmware
Same vendor: Hitachi Energy
Same weakness: CWE-476