Microsoft Visual Studio Products (April 2026)

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

include('compat.inc');

if (description)
{
  script_id(307350);
  script_version("1.2");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/20");

  script_cve_id("CVE-2026-21637");
  script_xref(name:"IAVA", value:"2026-A-0347");

  script_name(english:"Microsoft Visual Studio Products (April 2026)");

  script_set_attribute(attribute:"synopsis", value:
"The Microsoft Visual Studio Products are affected by a denial of service vulnerability.");
  script_set_attribute(attribute:"description", value:
"The Microsoft Visual Studio Products are missing a security update.
It is, therefore, affected by a denial of service vulnerability:

  - In Node.js TLS error handling allows remote attackers to crash or exhaust resources
    of a TLS server when pskCallback or ALPNCallback are in use.
    Synchronous exceptions thrown during these callbacks bypass
    standard TLS error handling paths (tlsClientError and error),
    causing either immediate process termination or silent file
    descriptor leaks that eventually lead to denial of service.
    Because these callbacks process attacker-controlled input during
    the TLS handshake, a remote client can repeatedly trigger the
    issue. The documented Visual Studio updates incorporate updates in Node.js
    which address this vulnerability.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21637");
  script_set_attribute(attribute:"see_also", value:"https://learn.microsoft.com/en-us/visualstudio/releases/2019/history");
  # https://learn.microsoft.com/en-us/visualstudio/releases/2022/release-history
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?f0f0c75d");
  script_set_attribute(attribute:"solution", value:
"Microsoft has released the following security updates to address this issue:
    - Update to 16.11.55 for Visual Studio 2019 16.11
    - Update to 17.12.19 for Visual Studio 2022 17.12
    - Update to 17.14.30 for Visual Studio 2022 17.14");
  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-2026-21637");

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

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/04/01");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/04/01");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/04/17");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:visual_studio");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ms_bulletin_checks_possible.nasl", "microsoft_visual_studio_installed.nbin");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible", "installed_sw/Microsoft Visual Studio", "SMB/Registry/Enumerated");
  script_require_ports(139, 445, "Host/patch_management_checks");

  exit(0);
}

include('vcf_extras_visual_studio.inc');

get_kb_item_or_exit('SMB/Registry/Enumerated');

var app_info = vcf::visual_studio::get_app_info();

var constraints = [
    {'product': '2019', 'min_version': '16.0', 'fixed_version': '16.11.37206.5', 'fixed_display': '16.11.55'},
    {'product': '2022', 'min_version': '17.12', 'fixed_version': '17.12.37202.15', 'fixed_display': '17.12.19'},
    {'product': '2022', 'min_version': '17.14', 'fixed_version': '17.14.37203.1', 'fixed_display': '17.14.30'}
];

vcf::visual_studio::check_version_and_report(
  app_info: app_info,
  constraints: constraints,
  severity: SECURITY_HOLE
);