High severity · published Oct 26, 2021
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
7.5
CVSS
2.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.7% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
7F
750-8202 Firmware · Wago
before fw20 · source: NVD
7F
750-8203 Firmware · Wago
before fw20 · source: NVD
7F
750-8204 Firmware · Wago
before fw20 · source: NVD
7F
750-8206 Firmware · Wago
before fw20 · source: NVD
7F
750-8207 Firmware · Wago
before fw20 · source: NVD
7F
750-8208 Firmware · Wago
before fw20 · source: NVD
7F
750-8210 Firmware · Wago
before fw20 · source: NVD
7F
750-8211 Firmware · Wago
before fw20 · source: NVD
7F
750-8212 Firmware · Wago
before fw20 · source: NVD
7F
750-8213 Firmware · Wago
before fw20 · source: NVD
7F
750-8214 Firmware · Wago
before fw20 · source: NVD
7F
750-8216 Firmware · Wago
before fw20 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34593
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34593
Exploit
http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html
Exploit
http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html
Mailing List
http://seclists.org/fulldisclosure/2021/Oct/64
Vendor Advisory
https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download=
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