What’s Vulnerable › Vulnerabilities
CVE-2026-17539
- Severity: medium (CVSS 5.9 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-09-03 · updated 2026-09-03
- Weakness: CWE-476
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.
Affected products
- Hitachi Energy RTU500 series CMU firmware: from 12.7.1 through 12.7.7; from 13.5.1 through 13.5.4; from 13.6.1 through 13.6.3; from 13.7.1 through 13.7.8; from 13.8.1 through 13.8.2
References
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