# CVE-2026-8479: Hitachi Energy IEC 60870-5-104 NULL pointer dereference DoS

Source: https://junglewise.ai/threats/cve-2026-8479-hitachi-energy-iec-60870-5-104-null-pointer-dereference-dos  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-26. Updated: 2026-05-26  
License: CC BY 4.0 with a link back

CVE-2026-8479 · Severity: info · CVSS 6.9 · Published 2026-05-26

A vulnerability exists in Hitachi Energy products using the IEC 60870-5-104 communication protocol, which is commonly used in electric power systems for telecontrol and monitoring. If the system is configured in bidirectional mode, an attacker could send a specific sequence of messages to crash the service. This results in a denial-of-service, potentially disrupting the monitoring and control of critical energy infrastructure.

Vendors: [Hitachi Energy](https://junglewise.ai/threats/vendors/hitachi-energy).

## Quick answers

**Is CVE-2026-8479 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8479 being exploited in the wild.

**How severe is CVE-2026-8479?** Informational severity, with a CVSS score of 6.9, published 26 May 2026.

**Which products and versions are affected?** Hitachi Energy IEC 60870-5-104 implementation.

**Is there a fix for CVE-2026-8479?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-8479 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2026-8479?** Check whether you run Hitachi Energy IEC 60870-5-104 implementation. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A NULL pointer dereference vulnerability (CWE-476) exists in the Hitachi Energy implementation of the IEC 60870-5-104 protocol. The flaw is triggered when the protocol is configured in bidirectional mode (BCI) and receives a specially crafted sequence of messages over a period of time. An attacker with adjacent network access and low privileges can exploit this to cause a crash of the affected service, resulting in a Denial of Service (DoS) impact. The vulnerability is specific to the bidirectional communication interface configuration.

## Affected products

- Hitachi Energy IEC 60870-5-104 implementation

## Timeline

- 2026-05-26: disclosed: Initial advisory publication by Hitachi Energy
- 2026-05-26: advisory: NVD record published

## References

- [https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch](https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch)