How severe is CVE-2026-8479?

CVE-2026-8479 has a CVSS 4.0 base score of 6.9, rated medium severity.

Is CVE-2026-8479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8479?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-8479 have an EU (EUVD) identifier?

Yes. CVE-2026-8479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31814.

When was CVE-2026-8479 published?

CVE-2026-8479 was published on 2026-05-26 and last updated on 2026-06-17.

CVE-2026-8479

CVE-2026-8479 is a medium-severity vulnerability with a CVSS 4.0 base score of 6.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 4.0 base score 6.9)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31814
Weakness: CWE-476
Published: 2026-05-26
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-8479?: 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.
How severe is CVE-2026-8479?: CVE-2026-8479 has a CVSS 4.0 base score of 6.9, rated medium severity.
Is CVE-2026-8479 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-8479?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-8479 have an EU (EUVD) identifier?: Yes. CVE-2026-8479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31814.
When was CVE-2026-8479 published?: CVE-2026-8479 was published on 2026-05-26 and last updated on 2026-06-17.

References

https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch

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