Hitachi Energy RTU500 NULL Pointer Dereference (CVE-2025-69421)

medium Tenable OT Security Plugin ID 505379

Synopsis

The remote OT asset is affected by a vulnerability.

Description

Processing a malformed PKCS#12 file can trigger a NULL pointer dereference in the PKCS12_item_decrypt_d2i_ex() function. A NULL pointer dereference can trigger a crash which leads to Denial of Service for an application processing PKCS#12 files. The PKCS12_item_decrypt_d2i_ex() function does not check whether the oct parameter is NULL before dereferencing it. When called from PKCS12_unpack_p7encdata() with a malformed PKCS#12 file, this parameter can be NULL, causing Denial of Service impact. The vulnerability is limited to Denial of Service and cannot be escalated to achieve code execution or memory disclosure.

Product is affected if a privileged user uploads a malformed PKCS#12 certificate via the web interface or if PKI client functionality is configured.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.

Solution

Upgrade the RTU500 series CMU firmware to a fixed version (13.8.2, or 13.7.9 / 12.7.8 depending on the installed branch as listed in the Hitachi Energy advisory) and apply the general mitigation factors and workarounds described in the advisory.

Plugin Details

Severity: Medium

ID: 505379

File Name: tenable_ot_abb_CVE-2025-69421.nasl

Version: 1.1

Type: Remote

Family: Tenable.ot

Published: 6/17/2026

Updated: 6/17/2026

Supported Sensors: Tenable OT Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Vulnerability Information

CPE: cpe:/o:hitachienergy:rtu520_firmware:12.7, cpe:/o:hitachienergy:rtu560_firmware:12.7, cpe:/o:hitachienergy:rtu540_firmware:12.7, cpe:/o:hitachienergy:rtu530_firmware:12.7, cpe:/o:hitachienergy:rtu520_firmware:13.5, cpe:/o:hitachienergy:rtu540_firmware:13.5, cpe:/o:hitachienergy:rtu560_firmware:13.5, cpe:/o:hitachienergy:rtu530_firmware:13.5, cpe:/o:hitachienergy:rtu520_firmware:13.8.1, cpe:/o:hitachienergy:rtu530_firmware:13.8.1, cpe:/o:hitachienergy:rtu540_firmware:13.8.1, cpe:/o:hitachienergy:rtu560_firmware:13.8.1, cpe:/o:hitachienergy:rtu560_firmware:13.6, cpe:/o:hitachienergy:rtu520_firmware:13.6, cpe:/o:hitachienergy:rtu540_firmware:13.6, cpe:/o:hitachienergy:rtu530_firmware:13.6, cpe:/o:hitachienergy:rtu540_firmware:13.7, cpe:/o:hitachienergy:rtu530_firmware:13.7, cpe:/o:hitachienergy:rtu560_firmware:13.7, cpe:/o:hitachienergy:rtu520_firmware:13.7

Required KB Items: Tenable.ot/ABB

Patch Publication Date: 5/26/2026

Vulnerability Publication Date: 5/26/2026

Reference Information

CVE: CVE-2025-69421

CWE: 476

ICSA: 26-155-04

Detections

Analytics