[NEW] [high] Hitachi Energy RTU500: Multiple Vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities in Hitachi Energy RTU500 allow attackers to cause denial of service through crashes, disclose authentication credentials and cookies, and bypass authentication.

Who is affected

Industrial control systems using Hitachi Energy RTU500 are affected.

Urgency

High severity; critical infrastructure devices are at risk of takeover, credential theft, and operational disruption.

Action

Apply Hitachi Energy patches for all eight CVEs (CVE-2026-17539, CVE-2026-11856, CVE-2026-28388, CVE-2026-6276, CVE-2026-6653, CVE-2026-6732, CVE-2026-8927, CVE-2026-8932) and conduct post-patch verification.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-09-03

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-3167

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-175390.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-118560.69% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-283880.89% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 57% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-62760.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-66530.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-67320.63% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 48% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-89270.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-89320.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.
• Moderate exploitation riskCVE-2026-90791.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 63% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• medium[UPDATE] [mittel] cURL: Mehrere Schwachstellencert-bund
• high[UPDATE] [hoch] cURL: Mehrere Schwachstellencert-bund
• medium[UPDATE] [mittel] cURL: Mehrere Schwachstellencert-bund
• unknownUSN-8670-3: curl vulnerabilityubuntu
• unknownMultiples vulnérabilités dans les produits VMware (07 septembre 2026)cert-fr-avis
• medium[UPDATE] [mittel] OpenSSL: Mehrere Schwachstellencert-bund
• mediumCVE-2026-17539: RTU500 has a vulnerability, where high-load scenarios, such as sending GI requests at short in…nvd
• medium[UPDATE] [medium] libxml2: Vulnerability allows denial of servicecert-bund
• high[NEW] [high] Meinberg LANTIME: Multiple vulnerabilitiescert-bund
• unknownUSN-8670-2: curl vulnerabilityubuntu
• unknownUSN-8670-1: curl vulnerabilityubuntu
• unknownUSN-8651-1: curl vulnerabilityubuntu

More from CERT-Bund (BSI) Security Advisories

• medium[UPDATE] [mittel] vim: Mehrere Schwachstellen2026-09-10
• medium[UPDATE] [mittel] ffmpeg: Mehrere Schwachstellen ermöglichen Codeausführung und DoS2026-09-10
• medium[UPDATE] [mittel] Unbound: Mehrere Schwachstellen2026-09-10
• high[UPDATE] [hoch] ffmpeg: Mehrere Schwachstellen2026-09-10
• high[UPDATE] [hoch] Internet Systems Consortium BIND: Mehrere Schwachstellen2026-09-10