CVE-2021-34593: CODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-service
First published: Tue Oct 26 2021(Updated: )
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.
Credit: info@cert.vde.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| CODESYS PLCWinNT | <2.4.7.56 | |
| Codesys Runtime Toolkit | <2.4.7.56 |
Remedy
CODESYS GmbH has released the following product versions to solve the noted vulnerability issue for the affected CODESYS products: * CODESYS Runtime Toolkit 32 bit full version V2.4.7.56 * CODESYS PLCWinNT version V2.4.7.56. This will also be part of the CODESYS Development System setup version V2.3.9.68.
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Reference Links
- http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html
- http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html
- http://seclists.org/fulldisclosure/2021/Oct/64
- https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download=
Frequently Asked Questions
What is CVE-2021-34593?
CVE-2021-34593 is a vulnerability found in CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT prior to versions V2.4.7.56, which can result in denial-of-service conditions.
What is the severity of CVE-2021-34593?
CVE-2021-34593 has a severity rating of 7.5 (high).
How does CVE-2021-34593 impact PLC programs?
CVE-2021-34593 can stop running PLC programs or cause memory leaks.
How can CVE-2021-34593 affect communication clients?
CVE-2021-34593 can block further communication clients from accessing the affected system.
Is there a fix available for CVE-2021-34593?
Yes, updating to versions V2.4.7.56 or above of CODESYS V2 Runtime Toolkit 32 Bit full and PLCWinNT can fix the vulnerability.
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