Vulnerability Monitor

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CVE-2021-34593

In CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56 unauthenticated crafted invalid requests may result in several denial-of-service conditions. Running PLC programs may be stopped, memory may be leaked, or further communication clients may be blocked from accessing the PLC.

Published

2021-10-26T10:15:08.013

Last Modified

2025-08-15T20:25:58.247

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-755

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	wago	750-8202_firmware	< fw20	Yes
Hardware	wago	750-8202	-	No
Operating System	wago	750-8203_firmware	< fw20	Yes
Hardware	wago	750-8203	-	No
Operating System	wago	750-8204_firmware	< fw20	Yes
Hardware	wago	750-8204	-	No
Operating System	wago	750-8206_firmware	< fw20	Yes
Hardware	wago	750-8206	-	No
Operating System	wago	750-8207_firmware	< fw20	Yes
Hardware	wago	750-8207	-	No
Operating System	wago	750-8208_firmware	< fw20	Yes
Hardware	wago	750-8208	-	No
Operating System	wago	750-8210_firmware	< fw20	Yes
Hardware	wago	750-8210	-	No
Operating System	wago	750-8211_firmware	< fw20	Yes
Hardware	wago	750-8211	-	No
Operating System	wago	750-8212_firmware	< fw20	Yes
Hardware	wago	750-8212	-	No
Operating System	wago	750-8213_firmware	< fw20	Yes
Hardware	wago	750-8213	-	No
Operating System	wago	750-8214_firmware	< fw20	Yes
Hardware	wago	750-8214	-	No
Operating System	wago	750-8216_firmware	< fw20	Yes
Hardware	wago	750-8216	-	No
Operating System	wago	750-8217_firmware	< fw20	Yes
Hardware	wago	750-8217	-	No
Application	codesys	plcwinnt	< 2.4.7.56	Yes
Application	codesys	runtime_toolkit	< 2.4.7.56	Yes

References

http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html Exploit, Third Party Advisory, VDB Entry ([email protected])
http://seclists.org/fulldisclosure/2021/Oct/64 Mailing List, Third Party Advisory ([email protected])
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download= Vendor Advisory ([email protected])
http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html Exploit, Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2021/Oct/64 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download= Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)