Is CVE-2026-8479 actively exploited?

No active exploitation of CVE-2026-8479 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-8479 be exploited remotely?

Partially. CVE-2026-8479 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2026-8479?

CVE-2026-8479 has a CVSS score of 6.9 (MEDIUM).

HOME VULNERABILITIESCVE-2026-8479

MEDIUM

CVE-2026-8479

CWE-476Published: May 26, 2026· Updated: May 26, 2026

6.9

CVSS v3.1

Official Description

IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable

for a NULL pointer dereferencing, if a specially crafted

sequence of messages is sent for a certain time, causing

Denial of Service impact.

Product is only affected if IEC 60870-5-104 functionality in

bidirectional mode (BCI) is configured.

NVD Source

Technical Analysis

CVE-2026-8479 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorAdjacent

Attack ComplexityLow

Privileges Req.Low

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:A/AC:L/AT:N/PR:L/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

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

News & Research Mentioning CVE-2026-8479

Hitachi Energy RTU500

CISA Alerts· Jun 4, 2026

View CSAF Summary Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. If exploited, these vulnerabilities primarily impact product availability, with potential secondary impacts on confidentiality and integrity. Please refer to the Recommended Immediate Actions for information about the mitigation/remediation. The following versions of Hitachi Energy RTU500 are affected: RTU500 series CMU Firmware vers:RTU500_series_CMU_Firmware/>=12.7.1| =13.5.1| =13.6.1| =13.7.1| =13.7.1|<=13.7.7 (CVE-2025-69421, CVE-2026-24515, CVE-2026-25210, CVE-2026-32776, CVE-2026-32777, CVE-2026-32778, CVE-2026-8479, CVE-2025-69421, CVE-2026-24515, CVE-2026-25210, CVE-2026-32776, CVE-2026-32777, CVE-2026-32778, CVE-2026-8479 [xlite_meta score:73 src:CISA Alerts xlite_fp:e0302865b72e9b97b1771d4c965cf7af6cfe4bd6f8338fe2df4d820e2ee37607]