Cisco IP Phones Stack-based Buffer Overflow (CVE-2025-20350)

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

include('compat.inc');

if (description)
{
  script_id(504991);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/05");

  script_cve_id("CVE-2025-20350");

  script_name(english:"Cisco IP Phones Stack-based Buffer Overflow (CVE-2025-20350)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco
IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running
Cisco SIP Software could allow an unauthenticated, remote attacker to
cause a DoS condition on an affected device. This vulnerability is due
to a buffer overflow when an affected device processes HTTP packets.
An attacker could exploit this vulnerability by sending crafted HTTP
input to the device. A successful exploit could allow the attacker to
cause the device to reload, resulting in a DoS condition. Note: To
exploit this vulnerability, the phone must be registered to Cisco
Unified Communications Manager and have Web Access enabled. Web Access
is disabled by default.

This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.");
  # https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-phone-dos-FPyjLV7A
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?83c0dd77");
  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-2025-20350");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_cwe_id(121);

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/10/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/10/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/19");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7811_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7811_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7811_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7821_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7821_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7821_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7841_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7841_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7841_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7861_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7861_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_7861_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8811_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8811_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8811_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%280.7%29:mpp");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%282%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%282%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%282%29:sr2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29:sr2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29:sr3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29:sr2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29:sr3");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr2");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr4");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr5");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8832_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8832_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8832_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8841_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8841_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8841_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8845_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8845_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8845_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8851_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8851_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8851_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8861_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8861_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8861_firmware:14.3%281%29:sr1");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8865_firmware");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8865_firmware:14.3%281%29");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:cisco:ip_phone_8865_firmware:14.3%281%29:sr1");
  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/Cisco");

  exit(0);
}


include('tenable_ot_cve_funcs.inc');

get_kb_item_or_exit('Tenable.ot/Cisco');

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

var vuln_cpes = {
    "cpe:/o:cisco:ip_phone_8865_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8865_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8865_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7811_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7811_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7811_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7821_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7821_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7821_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7841_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7841_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7841_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7861_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7861_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_7861_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8811_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8811_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8811_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8832_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8832_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8832_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8841_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8841_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8841_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8845_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8845_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8845_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8851_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8851_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8851_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8861_firmware" :
        {"versionEndExcluding" : "14.3\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8861_firmware:14.3%281%29" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8861_firmware:14.3%281%29:sr1" :
        {"versionEndIncluding" : "14.3%281%29", "versionStartIncluding" : "14.3%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware" :
        {"versionEndExcluding" : "11.0\(1\)", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%280.7%29:mpp" :
        {"versionEndIncluding" : "11.0%280.7%29", "versionStartIncluding" : "11.0%280.7%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%281%29" :
        {"versionEndIncluding" : "11.0%281%29", "versionStartIncluding" : "11.0%281%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%282%29" :
        {"versionEndIncluding" : "11.0%282%29", "versionStartIncluding" : "11.0%282%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%282%29:sr1" :
        {"versionEndIncluding" : "11.0%282%29", "versionStartIncluding" : "11.0%282%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%282%29:sr2" :
        {"versionEndIncluding" : "11.0%282%29", "versionStartIncluding" : "11.0%282%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr1" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr2" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr3" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr4" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr5" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%283%29:sr6" :
        {"versionEndIncluding" : "11.0%283%29", "versionStartIncluding" : "11.0%283%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29" :
        {"versionEndIncluding" : "11.0%284%29", "versionStartIncluding" : "11.0%284%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29:sr1" :
        {"versionEndIncluding" : "11.0%284%29", "versionStartIncluding" : "11.0%284%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29:sr2" :
        {"versionEndIncluding" : "11.0%284%29", "versionStartIncluding" : "11.0%284%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%284%29:sr3" :
        {"versionEndIncluding" : "11.0%284%29", "versionStartIncluding" : "11.0%284%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29" :
        {"versionEndIncluding" : "11.0%285%29", "versionStartIncluding" : "11.0%285%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29:sr1" :
        {"versionEndIncluding" : "11.0%285%29", "versionStartIncluding" : "11.0%285%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29:sr2" :
        {"versionEndIncluding" : "11.0%285%29", "versionStartIncluding" : "11.0%285%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%285%29:sr3" :
        {"versionEndIncluding" : "11.0%285%29", "versionStartIncluding" : "11.0%285%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29" :
        {"versionEndIncluding" : "11.0%286%29", "versionStartIncluding" : "11.0%286%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr1" :
        {"versionEndIncluding" : "11.0%286%29", "versionStartIncluding" : "11.0%286%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr2" :
        {"versionEndIncluding" : "11.0%286%29", "versionStartIncluding" : "11.0%286%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr4" :
        {"versionEndIncluding" : "11.0%286%29", "versionStartIncluding" : "11.0%286%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr5" :
        {"versionEndIncluding" : "11.0%286%29", "versionStartIncluding" : "11.0%286%29", "family" : "CiscoIPPhones"},
    "cpe:/o:cisco:ip_phone_8821_firmware:11.0%286%29:sr6" :
        {"versionEndIncluding" : "11.0%286%29", "versionStartIncluding" : "11.0%286%29", "family" : "CiscoIPPhones"}
};

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