Details of VAR-202110-1253

ID

VAR-202110-1253

CVE

CVE-2021-34586

TITLE

CODESYS V2 on the web server NULL Pointer dereference vulnerability

Trust: 0.8

sources: JVNDB: JVNDB-2021-014202

DESCRIPTION

In the CODESYS V2 web server prior to V1.1.9.22 crafted web server requests may cause a Null pointer dereference in the CODESYS web server and may result in a denial-of-service condition

Trust: 1.71

sources: NVD: CVE-2021-34586 // JVNDB: JVNDB-2021-014202 // VULMON: CVE-2021-34586

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-2021-014202 // NVD: CVE-2021-34586

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov:	CVE-2021-34586
value:	HIGH
Trust: 1.0
info@cert.vde.com:	CVE-2021-34586
value:	HIGH
Trust: 1.0
NVD:	CVE-2021-34586
value:	HIGH
Trust: 0.8
CNNVD:	CNNVD-202110-1818
value:	HIGH
Trust: 0.6
VULMON:	CVE-2021-34586
value:	MEDIUM
Trust: 0.1

nvd@nist.gov:	CVE-2021-34586
severity:	MEDIUM
baseScore:	5.0
vectorString:	AV:N/AC:L/AU:N/C:N/I:N/A:P
accessVector:	NETWORK
accessComplexity:	LOW
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	PARTIAL
exploitabilityScore:	10.0
impactScore:	2.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 1.9

nvd@nist.gov:	CVE-2021-34586
baseSeverity:	HIGH
baseScore:	7.5
vectorString:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	3.9
impactScore:	3.6
version:	3.1
Trust: 2.0
OTHER:	JVNDB-2021-014202
baseSeverity:	HIGH
baseScore:	7.5
vectorString:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	NONE
impactScore:	NONE
version:	3.0
Trust: 0.8

sources: VULMON: CVE-2021-34586 // JVNDB: JVNDB-2021-014202 // CNNVD: CNNVD-202110-1818 // NVD: CVE-2021-34586 // NVD: CVE-2021-34586

PROBLEMTYPE DATA

problemtype:	CWE-476	Trust: 1.0
problemtype:	NULL Pointer dereference (CWE-476) [NVD evaluation ]	Trust: 0.8

sources: JVNDB: JVNDB-2021-014202 // NVD: CVE-2021-34586

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202110-1818

TYPE

code problem

Trust: 0.6

sources: CNNVD: CNNVD-202110-1818

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 Fixes for code issue vulnerabilities	url:	http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=167871	Trust: 0.6

sources: JVNDB: JVNDB-2021-014202 // CNNVD: CNNVD-202110-1818

EXTERNAL IDS

db:	NVD	id:	CVE-2021-34586	Trust: 3.3
db:	TENABLE	id:	TRA-2021-47	Trust: 2.5
db:	JVNDB	id:	JVNDB-2021-014202	Trust: 0.8
db:	CNNVD	id:	CNNVD-202110-1818	Trust: 0.6
db:	VULMON	id:	CVE-2021-34586	Trust: 0.1

sources: VULMON: CVE-2021-34586 // JVNDB: JVNDB-2021-014202 // CNNVD: CNNVD-202110-1818 // NVD: CVE-2021-34586

REFERENCES

url:	https://www.tenable.com/security/research/tra-2021-47	Trust: 2.5
url:	https://customers.codesys.com/index.php?eid=dumpfile&t=f&f=16876&token=a3f1d937f95e7034879f4f2ea8e5a99b168256a7&download=	Trust: 1.7
url:	https://nvd.nist.gov/vuln/detail/cve-2021-34586	Trust: 1.4
url:	https://cwe.mitre.org/data/definitions/476.html	Trust: 0.2
url:	https://nvd.nist.gov	Trust: 0.1

sources: VULMON: CVE-2021-34586 // JVNDB: JVNDB-2021-014202 // CNNVD: CNNVD-202110-1818 // NVD: CVE-2021-34586

SOURCES

db:	VULMON	id:	CVE-2021-34586
db:	JVNDB	id:	JVNDB-2021-014202
db:	CNNVD	id:	CNNVD-202110-1818
db:	NVD	id:	CVE-2021-34586

LAST UPDATE DATE

2025-08-16T23:08:29.572000+00:00

SOURCES UPDATE DATE

db:	VULMON	id:	CVE-2021-34586	date:	2021-10-28T00:00:00
db:	JVNDB	id:	JVNDB-2021-014202	date:	2022-10-07T07:36:00
db:	CNNVD	id:	CNNVD-202110-1818	date:	2021-11-01T00:00:00
db:	NVD	id:	CVE-2021-34586	date:	2025-08-15T20:26:04.430

SOURCES RELEASE DATE

db:	VULMON	id:	CVE-2021-34586	date:	2021-10-26T00:00:00
db:	JVNDB	id:	JVNDB-2021-014202	date:	2022-10-07T00:00:00
db:	CNNVD	id:	CNNVD-202110-1818	date:	2021-10-26T00:00:00
db:	NVD	id:	CVE-2021-34586	date:	2021-10-26T10:15:07.957