Hitachi Energy RTU500 CMU up to 13.8.1 Bidirectional Mode null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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3.5$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Hitachi Energy RTU500 CMU up to 12.7.7/13.5.4/13.6.3/13.7.8/13.8.1. This impacts an unknown function of the component Bidirectional Mode. Such manipulation leads to null pointer dereference. This vulnerability is referenced as CVE-2026-8479. The attack needs to be initiated within the local network. No exploit is available.

Detailsinfo

A vulnerability was found in Hitachi Energy RTU500 CMU up to 12.7.7/13.5.4/13.6.3/13.7.8/13.8.1. It has been rated as problematic. Affected by this issue is an unknown functionality of the component Bidirectional Mode. The manipulation with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

IEC 60870-5-104 used in bidirectional mode 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.

The advisory is shared for download at publisher.hitachienergy.com. This vulnerability is handled as CVE-2026-8479 since 05/13/2026. The exploitation is known to be easy. The attack can only be done within the local network. There are neither technical details nor an exploit publicly available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

05/13/2026 CVE reserved
05/26/2026 +13 days Advisory disclosed
05/26/2026 +0 days VulDB entry created
05/26/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: publisher.hitachienergy.com
Status: Confirmed

CVE: CVE-2026-8479 (🔒)
GCVE (CVE): GCVE-0-2026-8479
GCVE (VulDB): GCVE-100-365660

Entryinfo

Created: 05/26/2026 17:29
Changes: 05/26/2026 17:29 (65)
Complete: 🔍
Cache ID: 216::103

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