CVE-2026-17539 — MEDIUM (5.9)

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.

CVSS Score

5.9

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Related Weaknesses (CWE)

CWE-476

References

https://publisher.hitachienergy.com/preview?DocumentID=8DBD000259&LanguageCode=e

FAQ

What is CVE-2026-17539?

CVE-2026-17539 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 ca...

How severe is CVE-2026-17539?

CVE-2026-17539 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-17539?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.