CVE-2026-8479 (GCVE-0-2026-8479)

Vulnerability from cvelistv5 – Published: 2026-05-26 11:54 – Updated: 2026-05-26 14:49
VLAI
Summary
IEC 60870-5-104 used in bidirectional mode in RTU500 is vulnerable for a NULL pointer dereferencing, if a specially crafted sequence of messages is sent for a certain time, causing Denial of Service impact. Product is only affected if IEC 60870-5-104 functionality in bidirectional mode (BCI) is configured.
Severity
6.9 (Medium)
CVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-476 - NULL pointer dereference
Assigner
References
Impacted products
Vendor Product Version
Hitachi Energy RTU500 series CMU firmware Affected: 12.7.1 , ≤ 12.7.7 (custom)
Affected: 13.5.1 , ≤ 13.5.4 (custom)
Affected: 13.6.1 , ≤ 13.6.3 (custom)
Affected: 13.7.1 , ≤ 13.7.8 (custom)
Affected: 13.8.1 (custom)
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.