Details of VAR-202110-1142

ID

VAR-202110-1142

CVE

CVE-2021-34596

TITLE

CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT Vulnerability in accessing uninitialized pointers in

Trust: 0.8

sources: JVNDB: JVNDB-2021-014194

DESCRIPTION

A crafted request may cause a read access to an uninitialized pointer in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, resulting in a denial-of-service condition

Trust: 1.62

sources: NVD: CVE-2021-34596 // JVNDB: JVNDB-2021-014194

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:	codesys	model:	plcwinnt	scope:	lt	version:	2.4.7.56	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:	codesys	model:	runtime toolkit	scope:	lt	version:	2.4.7.56	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:	plcwinnt	scope:	-	version:	-	Trust: 0.8
vendor:	codesys	model:	runtime toolkit	scope:	eq	version:	2.4.7.56	Trust: 0.8

sources: JVNDB: JVNDB-2021-014194 // NVD: CVE-2021-34596

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov:	CVE-2021-34596
value:	MEDIUM
Trust: 1.0
info@cert.vde.com:	CVE-2021-34596
value:	MEDIUM
Trust: 1.0
NVD:	CVE-2021-34596
value:	MEDIUM
Trust: 0.8
CNNVD:	CNNVD-202110-1825
value:	MEDIUM
Trust: 0.6

nvd@nist.gov:	CVE-2021-34596
severity:	MEDIUM
baseScore:	4.0
vectorString:	AV:N/AC:L/AU:S/C:N/I:N/A:P
accessVector:	NETWORK
accessComplexity:	LOW
authentication:	SINGLE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	PARTIAL
exploitabilityScore:	8.0
impactScore:	2.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 1.8

nvd@nist.gov:	CVE-2021-34596
baseSeverity:	MEDIUM
baseScore:	6.5
vectorString:	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	LOW
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	2.8
impactScore:	3.6
version:	3.1
Trust: 2.0
OTHER:	JVNDB-2021-014194
baseSeverity:	MEDIUM
baseScore:	6.5
vectorString:	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	LOW
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	NONE
impactScore:	NONE
version:	3.0
Trust: 0.8

sources: JVNDB: JVNDB-2021-014194 // CNNVD: CNNVD-202110-1825 // NVD: CVE-2021-34596 // NVD: CVE-2021-34596

PROBLEMTYPE DATA

problemtype:	CWE-824	Trust: 1.0
problemtype:	Accessing uninitialized pointers (CWE-824) [ others ]	Trust: 0.8

sources: JVNDB: JVNDB-2021-014194 // NVD: CVE-2021-34596

THREAT TYPE

remote

Trust: 0.6

sources: CNNVD: CNNVD-202110-1825

TYPE

buffer error

Trust: 0.6

sources: CNNVD: CNNVD-202110-1825

PATCH

title:	Advisory 2021-17	url:	https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16878&token=e5644ec405590e66aefa62304cb8632df9fc9e9c&download=	Trust: 0.8
title:	CODESYS Buffer error vulnerability fix	url:	http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=167877	Trust: 0.6

sources: JVNDB: JVNDB-2021-014194 // CNNVD: CNNVD-202110-1825

EXTERNAL IDS

db:	NVD	id:	CVE-2021-34596	Trust: 3.2
db:	JVNDB	id:	JVNDB-2021-014194	Trust: 0.8
db:	CNNVD	id:	CNNVD-202110-1825	Trust: 0.6

sources: JVNDB: JVNDB-2021-014194 // CNNVD: CNNVD-202110-1825 // NVD: CVE-2021-34596

REFERENCES

url:	https://customers.codesys.com/index.php?eid=dumpfile&t=f&f=16878&token=e5644ec405590e66aefa62304cb8632df9fc9e9c&download=	Trust: 1.6
url:	https://nvd.nist.gov/vuln/detail/cve-2021-34596	Trust: 1.4

sources: JVNDB: JVNDB-2021-014194 // CNNVD: CNNVD-202110-1825 // NVD: CVE-2021-34596

SOURCES

db:	JVNDB	id:	JVNDB-2021-014194
db:	CNNVD	id:	CNNVD-202110-1825
db:	NVD	id:	CVE-2021-34596

LAST UPDATE DATE

2025-08-16T23:21:27.177000+00:00

SOURCES UPDATE DATE

db:	JVNDB	id:	JVNDB-2021-014194	date:	2022-10-07T06:54:00
db:	CNNVD	id:	CNNVD-202110-1825	date:	2021-11-01T00:00:00
db:	NVD	id:	CVE-2021-34596	date:	2025-08-15T20:24:15.653

SOURCES RELEASE DATE

db:	JVNDB	id:	JVNDB-2021-014194	date:	2022-10-07T00:00:00
db:	CNNVD	id:	CNNVD-202110-1825	date:	2021-10-26T00:00:00
db:	NVD	id:	CVE-2021-34596	date:	2021-10-26T10:15:08.127