CVE-2021-34584

🗓️ 26 Oct 2021 09:55:46Reported by CERTVDEType

Crafted web server requests exploit CVE-2021-34584 to read partial memory or trigger denial-of-service in CODESYS V2 web server

Reporter	Title	Published	Views	Family All 10
ATTACKERKB	CVE-2021-34584	25 Oct 202114:00	–	attackerkb
Circl	CVE-2021-34584	26 Oct 202114:14	–	circl
CNNVD	CODESYS 安全漏洞	26 Oct 202100:00	–	cnnvd
Cvelist	CVE-2021-34584 CODESYS V2 web server: crafted requests could trigger a buffer over-read (DoS)	26 Oct 202109:55	–	cvelist
EUVD	EUVD-2021-21234	7 Oct 202500:30	–	euvd
NVD	CVE-2021-34584	26 Oct 202110:15	–	nvd
OSV	CVE-2021-34584	26 Oct 202110:15	–	osv
Prion	Design/Logic Flaw	26 Oct 202110:15	–	prion
Positive Technologies	PT-2021-20565 · 3S Smart Software Solutions · Codesys V2	26 Oct 202100:00	–	ptsecurity
Tenable Nessus	Wago CODESYS V2 Web-Server Buffer Over-read (CVE-2021-34584)	9 Sep 202500:00	–	nessus

NVD

Vulners

Node

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wago 750-823_firmwareRange<fw10

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wago 750-890_firmwareRange<fw10

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wago 750-8217_firmwareRange<fw20

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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

9High risk

Vulners AI Score9

CVSS 26.4

CVSS 3.19.1

EPSS0.01075

CWE-126