Siemens SCALANCE Improper Authentication (CVE-2020-26139)

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

include('compat.inc');

if (description)
{
  script_id(505332);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/23");

  script_cve_id("CVE-2020-26139");
  script_xref(name:"ICSA", value:"22-104-04");

  script_name(english:"Siemens SCALANCE Improper Authentication (CVE-2020-26139)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"An issue was discovered in the kernel in NetBSD 7.1. An Access Point
(AP) forwards EAPOL frames to other clients even though the sender has
not yet successfully authenticated to the AP. This might be abused in
projected Wi-Fi networks to launch denial-of-service attacks against
connected clients and makes it easier to exploit other vulnerabilities
in connected clients.

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-913875.html");
  script_set_attribute(attribute:"see_also", value:"https://cert-portal.siemens.com/productcert/html/ssa-019200.html");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109996102/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109805887/");
  script_set_attribute(attribute:"see_also", value:"https://support.industry.siemens.com/cs/ww/en/view/109808629/");
  script_set_attribute(attribute:"see_also", value:"https://www.cisa.gov/news-events/ics-advisories/icsa-22-104-04");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:A/AC:M/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:A/AC:H/PR:N/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-2020-26139");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(287);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/07/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/07/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/21");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w1748-1_m12_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w1788-1_m12_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w1788-2_eec_m12_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w1788-2_m12_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w1788-2ia_m12_firmware:3.0.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w721-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w722-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w734-1_rj45_%28usa%29_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w734-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w738-1_m12_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w748-1_m12_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w748-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w761-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w774-1_m12_eec_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w774-1_rj45_%28usa%29_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w774-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w778-1_m12_eec_%28usa%29_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w778-1_m12_eec_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w778-1_m12_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w786-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w786-2_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w786-2_sfp_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w786-2ia_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w788-1_m12_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w788-1_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w788-2_m12_eec_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w788-2_m12_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_w788-2_rj45_firmware:6.6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam763-1_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_eec_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wam766-1_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum763-1_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:1.2.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:siemens:scalance_wum766-1_firmware:1.2.0");
  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:scalance_wam763-1_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-7DA0']},
    "cpe:/o:siemens:scalance_wam766-1_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DA0']},
    "cpe:/o:siemens:scalance_wam766-1_%28us%29_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7DB0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TA0']},
    "cpe:/o:siemens:scalance_wam766-1_eec_%28us%29_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-7TB0']},
    "cpe:/o:siemens:scalance_wum763-1_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5763-1AL00-3AA0', '6GK5763-1AL00-3DA0']},
    "cpe:/o:siemens:scalance_wum766-1_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DA0']},
    "cpe:/o:siemens:scalance_wum766-1_%28usa%29_firmware:1.2.0" :
        {"versionEndExcluding" : "1.2.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5766-1GE00-3DB0']},
    "cpe:/o:siemens:scalance_w1748-1_m12_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5748-1GY01-0TA0', '6GK5748-1GY01-0AA0']},
    "cpe:/o:siemens:scalance_w1788-1_m12_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-1GY01-0AA0']},
    "cpe:/o:siemens:scalance_w1788-2_eec_m12_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-2GY01-0TA0']},
    "cpe:/o:siemens:scalance_w1788-2_m12_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-2GY01-0AA0']},
    "cpe:/o:siemens:scalance_w1788-2ia_m12_firmware:3.0.0" :
        {"versionEndExcluding" : "3.0.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-2HY01-0AA0']},
    "cpe:/o:siemens:scalance_w721-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5721-1FC00-0AA0', '6GK5721-1FC00-0AB0']},
    "cpe:/o:siemens:scalance_w722-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5722-1FC00-0AB0', '6GK5722-1FC00-0AC0', '6GK5722-1FC00-0AA0']},
    "cpe:/o:siemens:scalance_w734-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5734-1FX00-0AA0', '6GK5734-1FX00-0AB0', '6GK5734-1FX00-0AA6']},
    "cpe:/o:siemens:scalance_w734-1_rj45_%28usa%29_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5734-1FX00-0AB6']},
    "cpe:/o:siemens:scalance_w738-1_m12_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5738-1GY00-0AA0', '6GK5738-1GY00-0AB0']},
    "cpe:/o:siemens:scalance_w748-1_m12_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5748-1GD00-0AB0', '6GK5748-1GD00-0AA0']},
    "cpe:/o:siemens:scalance_w748-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5748-1FC00-0AA0', '6GK5748-1FC00-0AB0']},
    "cpe:/o:siemens:scalance_w761-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5761-1FC00-0AA0', '6GK5761-1FC00-0AB0']},
    "cpe:/o:siemens:scalance_w774-1_m12_eec_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5774-1FY00-0TB0', '6GK5774-1FY00-0TA0']},
    "cpe:/o:siemens:scalance_w774-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5774-1FX00-0AA6', '6GK5774-1FX00-0AA0', '6GK5774-1FX00-0AC0', '6GK5774-1FX00-0AB0']},
    "cpe:/o:siemens:scalance_w774-1_rj45_%28usa%29_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5774-1FX00-0AB6']},
    "cpe:/o:siemens:scalance_w778-1_m12_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5778-1GY00-0AA0', '6GK5778-1GY00-0AB0']},
    "cpe:/o:siemens:scalance_w778-1_m12_eec_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5778-1GY00-0TA0']},
    "cpe:/o:siemens:scalance_w778-1_m12_eec_%28usa%29_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5778-1GY00-0TB0']},
    "cpe:/o:siemens:scalance_w786-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5786-1FC00-0AA0', '6GK5786-1FC00-0AB0']},
    "cpe:/o:siemens:scalance_w786-2_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5786-2FC00-0AC0', '6GK5786-2FC00-0AA0', '6GK5786-2FC00-0AB0']},
    "cpe:/o:siemens:scalance_w786-2_sfp_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5786-2FE00-0AA0', '6GK5786-2FE00-0AB0']},
    "cpe:/o:siemens:scalance_w786-2ia_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5786-2HC00-0AB0', '6GK5786-2HC00-0AA0']},
    "cpe:/o:siemens:scalance_w788-1_m12_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-1GD00-0AA0', '6GK5788-1GD00-0AB0']},
    "cpe:/o:siemens:scalance_w788-1_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-1FC00-0AB0', '6GK5788-1FC00-0AA0']},
    "cpe:/o:siemens:scalance_w788-2_m12_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-2GD00-0AA0', '6GK5788-2GD00-0AB0']},
    "cpe:/o:siemens:scalance_w788-2_m12_eec_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-2GD00-0TB0', '6GK5788-2GD00-0TC0', '6GK5788-2GD00-0TA0']},
    "cpe:/o:siemens:scalance_w788-2_rj45_firmware:6.6.0" :
        {"versionEndExcluding" : "6.6.0", "family" : "SCALANCEW", "orderNumbers" : ['6GK5788-2FC00-0AB0', '6GK5788-2FC00-0AC0', '6GK5788-2FC00-0AA0']}
};

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