Quick answers
- Is CVE-2026-9079 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-9079 being exploited in the wild.
- How severe is CVE-2026-9079?
- High severity, with a CVSS score of 5.9, published 3 September 2026.
- Which products and versions are affected?
- Hitachi Energy RTU500 <UNKNOWN>.
- Is there a fix for CVE-2026-9079?
- 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-2026-9079 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-9079?
- Check whether you run Hitachi Energy RTU500 at an affected version. 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
The vulnerability is a NULL pointer dereference in the enhanced message queue's last entry handler within the BCI_IEC104 component. When rapid GI (general interrogation) requests are sent at short intervals, the high-load scenario triggers improper memory management that results in a NULL pointer access. This causes a fatal write error in the IEC 104 bidirectional communication, forcing connection interruption and device restart. An attacker with network access to send IEC 104 commands could trigger this denial of service condition without requiring authentication.
Affected products
- Hitachi Energy RTU500 <UNKNOWN>
Identifiers
- CVE-2026-9079
- CVE-2026-6732
- CVE-2026-6653
- CVE-2026-6276
- CVE-2026-17539
- CVE-2026-11856
- CVE-2026-8932
- CVE-2026-28388
- CVE-2026-8927
Timeline
- 2026-09-03: disclosed