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Wago CODESYS V2 Runtime Toolkit Improper Restriction of Operations within the Bounds of a Memory Buffer (CVE-2021-34595)

🗓️ 09 Sep 2025 00:00:00Reported by TenableType 
nessus
 nessus🔗 www.tenable.com👁 8 Views

CVE-2021-34595 allows out-of-bounds read/write in Wago Codesys V2 Toolkit, causing denial of service or memory overwrite.

Related
Refs
Code
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB		CVE-2021-34595
25 Oct 202114:00
–attackerkb
circl
Circl		CVE-2021-34595
26 Oct 202114:14
–circl
cnnvd
CNNVD		CODESYS 缓冲区错误漏洞
26 Oct 202100:00
–cnnvd
cve
CVE		CVE-2021-34595
26 Oct 202109:55
–cve
cvelist
Cvelist		CVE-2021-34595 CODESYS V2 runtime: out-of-bounds read or write access may result in denial-of-service
26 Oct 202109:55
–cvelist
euvd
EUVD		EUVD-2021-21245
7 Oct 202500:30
–euvd
nvd
NVD		CVE-2021-34595
26 Oct 202110:15
–nvd
osv
OSV		CVE-2021-34595
26 Oct 202110:15
–osv
prion
Prion		Out-of-bounds
26 Oct 202110:15
–prion
ptsecurity
Positive Technologies		PT-2021-20570 · 3S Smart Software Solutions · Codesys V2 Runtime Toolkit +1
26 Oct 202100:00
–ptsecurity
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(503327);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/09/09");

  script_cve_id("CVE-2021-34595");

  script_name(english:"Wago CODESYS V2 Runtime Toolkit Improper Restriction of Operations within the Bounds of a Memory Buffer (CVE-2021-34595)");

  script_set_attribute(attribute:"synopsis", value:
"The remote OT asset is affected by a vulnerability.");
  script_set_attribute(attribute:"description", value:
"A crafted request with invalid offsets may cause an out-of-bounds read
or write access in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT
prior to versions V2.4.7.56, resulting in a denial-of-service
condition or local memory overwrite.

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:"http://www.nessus.org/u?5962aea6");
  script_set_attribute(attribute:"solution", value:
"Refer to the vendor advisory.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:N/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-34595");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_cwe_id(119, 823);

  script_set_attribute(attribute:"vuln_publication_date", value:"2021/10/26");
  script_set_attribute(attribute:"patch_publication_date", value:"2021/10/26");
  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 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:750-823_firmware" :
        {"versionEndExcluding" : "fw10", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-829_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-831_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-832_firmware" :
        {"versionEndExcluding" : "fw10", "family" : "Controller750"},
    "cpe:/o:wago:750-852_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-862_firmware" :
        {"versionEndExcluding" : "fw10", "family" : "Controller750"},
    "cpe:/o:wago:750-880_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-881_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-882_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-885_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-889_firmware" :
        {"versionEndExcluding" : "fw17", "family" : "Controller750"},
    "cpe:/o:wago:750-890_firmware" :
        {"versionEndExcluding" : "fw10", "family" : "Controller750"},
    "cpe:/o:wago:750-891_firmware" :
        {"versionEndExcluding" : "fw10", "family" : "Controller750"},
    "cpe:/o:wago:750-893_firmware" :
        {"versionEndExcluding" : "fw10", "family" : "Controller750"},
    "cpe:/o:wago:750-8202_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8203_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8204_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8206_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8207_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8208_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8210_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8211_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8212_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8213_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8214_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8216_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"},
    "cpe:/o:wago:750-8217_firmware" :
        {"versionEndExcluding" : "fw20", "family" : "ControllerPFC200"}
};

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

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09 Sep 2025 00:00Current
7.7High risk
Vulners AI Score7.7
CVSS 25.5
CVSS 3.18.1
EPSS0.00879
wago codesysmemory boundsout of boundsread write accessdenial servicememory overwritetenable ot
8