PT-2026-43244 · Rtu500 · Rtu500

Published 2026-05-26 · Updated 2026-05-26 · CVE-2026-8479

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions RTU500 (affected versions not specified)

Description RTU500 is susceptible to a NULL pointer dereferencing when IEC 60870-5-104 functionality is configured in bidirectional mode (BCI). A specially crafted sequence of messages sent over a specific duration can trigger this condition, resulting in a Denial of Service (DoS), which is a state where the system becomes unavailable to its intended users.

Recommendations As a temporary workaround, restrict or disable the use of IEC 60870-5-104 functionality in bidirectional mode (BCI). At the moment, there is no information about a newer version that contains a fix for this vulnerability.

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-8479

Affected Products

Rtu500

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-8479 · Security Note
• https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch · Note