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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.

RTU500 存在一个漏洞：在高负载场景下（例如以较短的时间间隔发送 GI 请求），可能导致增强型消息队列最后一个条目发生空指针解引用。这会引发 BCI_IEC104 的致命写错误，导致连接中断并重启，最终造成 IEC 60870-5-104 双向通信的服务中断。

CVSS 5.9 · Medium EPSS 0.35% · P28

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

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 SYS600 RBAC权限提升至Windows管理员漏洞
CVE-2026-9853 8.5 HIGH SYS600 认证缺失致对象越权读写漏洞
CVE-2026-9852 4.6 MEDIUM SYS600 CSV注入漏洞

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-17539

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