Moxa VPort Cameras Integer Underflow (CVE-2021-25849)

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

include('compat.inc');

if (description)
{
  script_id(505210);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/03/09");

  script_cve_id("CVE-2021-25849");

  script_name(english:"Moxa VPort Cameras Integer Underflow (CVE-2021-25849)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"An integer underflow was discovered in userdisk/vport_lldpd in Moxa
Camera VPort 06EC-2V Series, version 1.1, improper validation of the
PortID TLV leads to Denial of Service via a crafted lldp packet.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://www.moxa.com/en/support/product-support/security-advisory/vport-06ec-2v-series-ip-cameras-vulnerabilities
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f7d269f4");
  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:C");
  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: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-2021-25849");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(191);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/05/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/06");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v26m_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v36m-ct-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v36m-ct_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v36m-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v42m-ct-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v42m-ct_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v42m-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v42m_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v60m-ct-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v60m-ct_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v60m-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v60m_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v80m-ct-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v80m-ct_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v80m-t_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:moxa:vport_06ec-2v80m_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/Moxa");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Moxa');

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

var vuln_cpes = {
    "cpe:/o:moxa:vport_06ec-2v26m_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v36m-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v36m-ct_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v36m-ct-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v42m_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v42m-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v42m-ct_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v42m-ct-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v60m_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v60m-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v60m-ct_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v60m-ct-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v80m_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v80m-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v80m-ct_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"},
    "cpe:/o:moxa:vport_06ec-2v80m-ct-t_firmware" :
        {"versionEndIncluding" : "1.1", "family" : "VPortCameras"}
};

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