Siemens Desigo DXR and PXC Controllers Improper Check For Unusual or Exceptional Conditions (CVE-2026-59693)

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

include('compat.inc');

if (description)
{
  script_id(506030);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/03");

  script_cve_id("CVE-2026-59693");

  script_name(english:"Siemens Desigo DXR and PXC Controllers Improper Check For Unusual or Exceptional Conditions (CVE-2026-59693)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability has been identified in Desigo DXR2 (All versions <
V01.21.233.16-7862), Desigo PXC3 (All versions < V01.21.233.16-7862),
Desigo PXC4 (All versions < V02.21.194.36-2715), Desigo PXC5.E003 (All
versions < V02.21.194.36-2715), Desigo PXC5.E24 (All versions <
V02.21.194.36-2715), Desigo PXC7 (All versions < V02.21.194.36-2715).
The affected devices are vulnerable to a denial-of-service (DoS)
vulnerability. An attacker can exploit this issue by sending a
malformed BACnet packet, causing the device to stop responding to
BACnet queries. Recovery requires a device reset or reboot to restore
normal functionality.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-781903.html");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-26-225-08");
  script_set_attribute(attribute:"solution", value:
"The following text was originally created by the Cybersecurity and Infrastructure Security Agency (CISA). The original
can be found at CISA.gov.");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-59693");
  script_cwe_id(754);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/08/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/02");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_dxr2_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc3_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc4_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc5.e003_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc5.e24_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc7_firmware");
  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/Siemens");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Siemens');

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

var vuln_cpes = {
    "cpe:/o:siemens:desigo_dxr2_firmware" :
        {"versionEndExcluding" : "01.21.233.16-7862", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc3_firmware" :
        {"versionEndExcluding" : "01.21.233.16-7862", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc4_firmware" :
        {"versionEndExcluding" : "02.21.194.36-2715", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc5.e003_firmware" :
        {"versionEndExcluding" : "02.21.194.36-2715", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc5.e24_firmware" :
        {"versionEndExcluding" : "02.21.194.36-2715", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc7_firmware" :
        {"versionEndExcluding" : "02.21.194.36-2715", "family" : "Desigo"}
};

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