Hitachi Energy RTU500 NULL Pointer Dereference (CVE-2026-32776)

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(505380);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/06/18");

  script_cve_id("CVE-2026-32776");
  script_xref(name:"ICSA", value:"26-155-04");

  script_name(english:"Hitachi Energy RTU500 NULL Pointer Dereference (CVE-2026-32776)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"libexpat before 2.7.5 allows a NULL pointer dereference with empty
external parameter entity content, causing Denial of Service impact.

Product is only affected if IEC 61850 functionality is configured.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://publisher.hitachienergy.com/preview?DocumentID=8DBD000252&LanguageCode=en&DocumentPartId=&Action=Launch
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d21730e8");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-26-155-04");
  script_set_attribute(attribute:"solution", value:
"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.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:L/Au:S/C:N/I:N/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-32776");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(476);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/05/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/05/26");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/06/17");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu520_firmware:12.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu520_firmware:13.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu520_firmware:13.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu520_firmware:13.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu520_firmware:13.8.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu530_firmware:12.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu530_firmware:13.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu530_firmware:13.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu530_firmware:13.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu530_firmware:13.8.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu540_firmware:12.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu540_firmware:13.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu540_firmware:13.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu540_firmware:13.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu540_firmware:13.8.1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu560_firmware:12.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu560_firmware:13.5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu560_firmware:13.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu560_firmware:13.7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:hitachienergy:rtu560_firmware:13.8.1");
  script_set_attribute(attribute:"generated_plugin", value:"former");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Tenable.ot");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("tenable_ot_api_integration.nasl");
  script_require_keys("Tenable.ot/ABB");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/ABB');

var asset = tenable_ot::assets::get(vendor:'ABB');

var vuln_cpes = {
    "cpe:/o:hitachienergy:rtu520_firmware:12.7" :
        {"versionStartIncluding" : "12.7.1", "versionEndIncluding" : "12.7.7", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu520_firmware:13.5" :
        {"versionStartIncluding" : "13.5.1", "versionEndIncluding" : "13.5.4", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu520_firmware:13.6" :
        {"versionStartIncluding" : "13.6.1", "versionEndIncluding" : "13.6.3", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu520_firmware:13.7" :
        {"versionStartIncluding" : "13.7.1", "versionEndIncluding" : "13.7.8", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu520_firmware:13.8.1" :
        {"versionStartIncluding" : "13.8.1", "versionEndIncluding" : "13.8.1", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu530_firmware:12.7" :
        {"versionStartIncluding" : "12.7.1", "versionEndIncluding" : "12.7.7", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu530_firmware:13.5" :
        {"versionStartIncluding" : "13.5.1", "versionEndIncluding" : "13.5.4", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu530_firmware:13.6" :
        {"versionStartIncluding" : "13.6.1", "versionEndIncluding" : "13.6.3", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu530_firmware:13.7" :
        {"versionStartIncluding" : "13.7.1", "versionEndIncluding" : "13.7.8", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu530_firmware:13.8.1" :
        {"versionStartIncluding" : "13.8.1", "versionEndIncluding" : "13.8.1", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu540_firmware:12.7" :
        {"versionStartIncluding" : "12.7.1", "versionEndIncluding" : "12.7.7", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu540_firmware:13.5" :
        {"versionStartIncluding" : "13.5.1", "versionEndIncluding" : "13.5.4", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu540_firmware:13.6" :
        {"versionStartIncluding" : "13.6.1", "versionEndIncluding" : "13.6.3", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu540_firmware:13.7" :
        {"versionStartIncluding" : "13.7.1", "versionEndIncluding" : "13.7.8", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu540_firmware:13.8.1" :
        {"versionStartIncluding" : "13.8.1", "versionEndIncluding" : "13.8.1", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu560_firmware:12.7" :
        {"versionStartIncluding" : "12.7.1", "versionEndIncluding" : "12.7.7", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu560_firmware:13.5" :
        {"versionStartIncluding" : "13.5.1", "versionEndIncluding" : "13.5.4", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu560_firmware:13.6" :
        {"versionStartIncluding" : "13.6.1", "versionEndIncluding" : "13.6.3", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu560_firmware:13.7" :
        {"versionStartIncluding" : "13.7.1", "versionEndIncluding" : "13.7.8", "family" : "AbbRTU500"},
    "cpe:/o:hitachienergy:rtu560_firmware:13.8.1" :
        {"versionStartIncluding" : "13.8.1", "versionEndIncluding" : "13.8.1", "family" : "AbbRTU500"}
};

tenable_ot::cve::compare_and_report(asset:asset, cpes:vuln_cpes, severity:SECURITY_WARNING);