Siemens Desigo PXC/PXM Controllers Out-of-bounds Read (CVE-2026-89208)

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

include('compat.inc');

if (description)
{
  script_id(506410);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/10/21");

  script_cve_id("CVE-2026-89208");

  script_name(english:"Siemens Desigo PXC/PXM Controllers Out-of-bounds Read (CVE-2026-89208)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"The affected product does not properly validate input bounds before accessing packet data. This could allow an unauthenticated remote attacker to trigger memory reads outside the intended packet boundaries.

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-333035.html");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss4_vector", value:"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N");
  script_set_attribute(attribute:"cvss4_threat_vector", value:"CVSS:4.0/E:U");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-89208");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(125);

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/10/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/10/20");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc00-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc00-u_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc001-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc100-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc12-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc128-u_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc200-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc22-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc22.1-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc36.1-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc50-e.d_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxc64-u_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:desigo_pxm20-e_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_pxc00-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc00-u_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc001-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc100-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc12-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc128-u_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc200-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc22-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc22.1-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc36.1-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc50-e.d_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxc64-u_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"},
    "cpe:/o:siemens:desigo_pxm20-e_firmware" :
        {"versionStartIncluding" : "2.3", "family" : "Desigo"}
};

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