Details of VAR-202110-1254

ID

VAR-202110-1254

CVE

CVE-2021-34584

TITLE

CODESYS V2 Buffer Overread Vulnerability in Web Server

Trust: 0.8

sources: JVNDB: JVNDB-2021-014204

DESCRIPTION

Crafted web server requests can be utilised to read partial stack or heap memory or may trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22

Trust: 1.62

sources: NVD: CVE-2021-34584 // JVNDB: JVNDB-2021-014204

AFFECTED PRODUCTS

vendor:	wago	model:	750-891	scope:	lt	version:	fw10	Trust: 1.0
vendor:	wago	model:	750-882	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-862	scope:	lt	version:	fw10	Trust: 1.0
vendor:	wago	model:	750-889	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-8202	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8207	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-829	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-852	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-8210	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8213	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8208	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8214	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8203	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-885	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-831	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-8216	scope:	lt	version:	fw20	Trust: 1.0
vendor:	codesys	model:	codesys	scope:	lt	version:	1.1.9.22	Trust: 1.0
vendor:	wago	model:	750-8204	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8211	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8206	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-823	scope:	lt	version:	fw10	Trust: 1.0
vendor:	wago	model:	750-832	scope:	lt	version:	fw10	Trust: 1.0
vendor:	wago	model:	750-880	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-881	scope:	lt	version:	fw17	Trust: 1.0
vendor:	wago	model:	750-8217	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-8212	scope:	lt	version:	fw20	Trust: 1.0
vendor:	wago	model:	750-890	scope:	lt	version:	fw10	Trust: 1.0
vendor:	wago	model:	750-893	scope:	lt	version:	fw10	Trust: 1.0
vendor:	codesys	model:	codesys	scope:	eq	version:	-	Trust: 0.8
vendor:	codesys	model:	codesys	scope:	eq	version:	1.1.9.22	Trust: 0.8

sources: JVNDB: JVNDB-2021-014204 // NVD: CVE-2021-34584

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov:	CVE-2021-34584
value:	CRITICAL
Trust: 1.0
info@cert.vde.com:	CVE-2021-34584
value:	CRITICAL
Trust: 1.0
NVD:	CVE-2021-34584
value:	CRITICAL
Trust: 0.8
CNNVD:	CNNVD-202110-1819
value:	CRITICAL
Trust: 0.6

nvd@nist.gov:	CVE-2021-34584
severity:	MEDIUM
baseScore:	6.4
vectorString:	AV:N/AC:L/AU:N/C:P/I:N/A:P
accessVector:	NETWORK
accessComplexity:	LOW
authentication:	NONE
confidentialityImpact:	PARTIAL
integrityImpact:	NONE
availabilityImpact:	PARTIAL
exploitabilityScore:	10.0
impactScore:	4.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 1.8

nvd@nist.gov:	CVE-2021-34584
baseSeverity:	CRITICAL
baseScore:	9.1
vectorString:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	HIGH
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	3.9
impactScore:	5.2
version:	3.1
Trust: 2.0
OTHER:	JVNDB-2021-014204
baseSeverity:	CRITICAL
baseScore:	9.1
vectorString:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	HIGH
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	NONE
impactScore:	NONE
version:	3.0
Trust: 0.8

sources: JVNDB: JVNDB-2021-014204 // CNNVD: CNNVD-202110-1819 // NVD: CVE-2021-34584 // NVD: CVE-2021-34584

PROBLEMTYPE DATA

problemtype:	CWE-126	Trust: 1.0
problemtype:	buffer over read (CWE-126) [ others ]	Trust: 0.8

sources: JVNDB: JVNDB-2021-014204 // NVD: CVE-2021-34584

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202110-1819

TYPE

other

Trust: 0.6

sources: CNNVD: CNNVD-202110-1819

PATCH

title:	Advisory 2021-15	url:	https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=	Trust: 0.8
title:	CODESYS Security vulnerabilities	url:	http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=168568	Trust: 0.6

sources: JVNDB: JVNDB-2021-014204 // CNNVD: CNNVD-202110-1819

EXTERNAL IDS

db:	NVD	id:	CVE-2021-34584	Trust: 3.2
db:	TENABLE	id:	TRA-2021-47	Trust: 2.4
db:	JVNDB	id:	JVNDB-2021-014204	Trust: 0.8
db:	CNNVD	id:	CNNVD-202110-1819	Trust: 0.6

sources: JVNDB: JVNDB-2021-014204 // CNNVD: CNNVD-202110-1819 // NVD: CVE-2021-34584

REFERENCES

url:	https://www.tenable.com/security/research/tra-2021-47	Trust: 2.4
url:	https://customers.codesys.com/index.php?eid=dumpfile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=	Trust: 1.6
url:	https://nvd.nist.gov/vuln/detail/cve-2021-34584	Trust: 1.4

sources: JVNDB: JVNDB-2021-014204 // CNNVD: CNNVD-202110-1819 // NVD: CVE-2021-34584

SOURCES

db:	JVNDB	id:	JVNDB-2021-014204
db:	CNNVD	id:	CNNVD-202110-1819
db:	NVD	id:	CVE-2021-34584

LAST UPDATE DATE

2025-08-16T23:08:29.548000+00:00

SOURCES UPDATE DATE

db:	JVNDB	id:	JVNDB-2021-014204	date:	2022-10-07T07:55:00
db:	CNNVD	id:	CNNVD-202110-1819	date:	2022-08-10T00:00:00
db:	NVD	id:	CVE-2021-34584	date:	2025-08-15T20:26:40.257

SOURCES RELEASE DATE

db:	JVNDB	id:	JVNDB-2021-014204	date:	2022-10-07T00:00:00
db:	CNNVD	id:	CNNVD-202110-1819	date:	2021-10-26T00:00:00
db:	NVD	id:	CVE-2021-34584	date:	2021-10-26T10:15:07.850