Vulnerability CVE-2021-34593
Published: 2021-10-26

Description:
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.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
CODESYS 2.4.7.0 Denial Of Service
Gerhard Hechenbe...
03.12.2021
Med.
WAGO 750-8xxx PLC Denial Of Service / User Enumeration
Gerhard Hechenbe...
07.02.2022

Type:

CWE-755

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Codesys -> Plcwinnt 
Codesys -> Runtime toolkit 

 References:
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download
=
http://seclists.org/fulldisclosure/2021/Oct/64
http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html
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