Wago CODESYS V2 Web-Server Classic Buffer Overflow (CVE-2021-30191)

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

include('compat.inc');

if (description)
{
  script_id(503318);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/21");

  script_cve_id("CVE-2021-30191");
  script_xref(name:"ICSA", value:"21-173-02");

  script_name(english:"Wago CODESYS V2 Web-Server Classic Buffer Overflow (CVE-2021-30191)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"CODESYS V2 Web-Server before 1.1.9.20 has a a Buffer Copy without
Checking the Size of the Input.

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://customers.codesys.com/index.php");
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?d28644c1");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-30191");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(120);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/25");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/09/09");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8202_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8203_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8204_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8206_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8207_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8208_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8210_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8211_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8212_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8213_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8214_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8216_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-8217_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-823_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-829_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-831_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-832_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-852_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-862_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-880_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-881_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-882_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-885_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-889_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-890_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-891_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:wago:750-893_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) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

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

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Wago');

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

var vuln_cpes = {
    "cpe:/o:wago:750-893_firmware" :
        {"versionEndExcluding" : "fw08", "family" : "Controller750"},
    "cpe:/o:wago:750-891_firmware" :
        {"versionEndExcluding" : "fw08", "family" : "Controller750"},
    "cpe:/o:wago:750-890_firmware" :
        {"versionEndExcluding" : "fw08", "family" : "Controller750"},
    "cpe:/o:wago:750-889_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "Controller750"},
    "cpe:/o:wago:750-885_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "Controller750"},
    "cpe:/o:wago:750-882_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "Controller750"},
    "cpe:/o:wago:750-881_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "Controller750"},
    "cpe:/o:wago:750-880_firmware" :
        {"versionEndExcluding" : "fw16", "family" : "Controller750"},
    "cpe:/o:wago:750-862_firmware" :
        {"versionEndExcluding" : "fw08", "family" : "Controller750"},
    "cpe:/o:wago:750-852_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "Controller750"},
    "cpe:/o:wago:750-832_firmware" :
        {"versionEndExcluding" : "fw08", "family" : "Controller750"},
    "cpe:/o:wago:750-831_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "Controller750"},
    "cpe:/o:wago:750-829_firmware" :
        {"versionEndExcluding" : "fw15", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8202_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8203_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8204_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8206_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8207_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8208_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8210_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8211_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8212_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8213_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8214_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8216_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8217_firmware" :
        {"versionEndExcluding" : "03.06.19_\(18\)", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-823_firmware" :
        {"versionEndExcluding" : "fw08", "family" : "ControllerPFC200"}
};

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