CVE-2021-34586

🗓️ 26 Oct 2021 09:55:49Reported by CERTVDEType

In CODESYS V2 web server prior to V1.1.9.22, crafted web server requests may cause Null pointer dereference, leading to denial-of-service

Reporter	Title	Published	Views	Family All 10
ATTACKERKB	CVE-2021-34586	25 Oct 202114:00	–	attackerkb
Circl	CVE-2021-34586	26 Oct 202114:14	–	circl
CNNVD	CODESYS 代码问题漏洞	26 Oct 202100:00	–	cnnvd
Cvelist	CVE-2021-34586 CODESYS V2 web server: crafted requests could trigger a null pointer dereference (DoS)	26 Oct 202109:55	–	cvelist
EUVD	EUVD-2021-21236	7 Oct 202500:30	–	euvd
NVD	CVE-2021-34586	26 Oct 202110:15	–	nvd
OSV	CVE-2021-34586	26 Oct 202110:15	–	osv
Prion	Null pointer dereference	26 Oct 202110:15	–	prion
Positive Technologies	PT-2021-20567 · 3S Smart Software Solutions · Codesys	26 Oct 202100:00	–	ptsecurity
Tenable Nessus	Wago CODESYS V2 Web-Server NULL Pointer Dereference (CVE-2021-34586)	9 Sep 202500:00	–	nessus

NVD

Vulners

Node

AND

wago 750-823_firmwareRange<fw10

wago 750-823Match-

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AND

wago 750-829_firmwareRange<fw17

wago 750-829Match-

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wago 750-831_firmwareRange<fw17

wago 750-831Match-

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wago 750-832_firmwareRange<fw10

wago 750-832Match-

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wago 750-852_firmwareRange<fw17

wago 750-852Match-

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AND

wago 750-862_firmwareRange<fw10

wago 750-862Match-

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AND

wago 750-880_firmwareRange<fw17

wago 750-880Match-

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AND

wago 750-881_firmwareRange<fw17

wago 750-881Match-

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AND

wago 750-882_firmwareRange<fw17

wago 750-882Match-

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AND

wago 750-885_firmwareRange<fw17

wago 750-885Match-

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AND

wago 750-889_firmwareRange<fw17

wago 750-889Match-

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AND

wago 750-890_firmwareRange<fw10

wago 750-890Match-

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AND

wago 750-891_firmwareRange<fw10

wago 750-891Match-

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AND

wago 750-893_firmwareRange<fw10

wago 750-893Match-

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AND

wago 750-8202_firmwareRange<fw20

wago 750-8202Match-

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wago 750-8203_firmwareRange<fw20

wago 750-8203Match-

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wago 750-8204_firmwareRange<fw20

wago 750-8204Match-

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wago 750-8206_firmwareRange<fw20

wago 750-8206Match-

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wago 750-8207_firmwareRange<fw20

wago 750-8207Match-

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AND

wago 750-8208_firmwareRange<fw20

wago 750-8208Match-

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AND

wago 750-8210_firmwareRange<fw20

wago 750-8210Match-

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AND

wago 750-8211_firmwareRange<fw20

wago 750-8211Match-

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AND

wago 750-8212_firmwareRange<fw20

wago 750-8212Match-

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wago 750-8213_firmwareRange<fw20

wago 750-8213Match-

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wago 750-8214_firmwareRange<fw20

wago 750-8214Match-

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wago 750-8216_firmwareRange<fw20

wago 750-8216Match-

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AND

wago 750-8217_firmwareRange<fw20

wago 750-8217Match-

Node

codesys codesysRange<1.1.9.22

[
  {
    "product": "CODESYS V2",
    "vendor": "CODESYS",
    "versions": [
      {
        "lessThan": "V1.1.9.22",
        "status": "affected",
        "version": "all web servers",
        "versionType": "custom"
      }
    ]
  }
]

Source	Link
tenable	www.tenable.com/security/research/tra-2021-47
customers	www.customers.codesys.com/index.php

17 Jun 2026 03:56Current

7.5High risk

Vulners AI Score7.5

CVSS 25

CVSS 3.17.5

EPSS0.13079

CWE-476