High severity7.5NVD Advisory· Published Oct 26, 2021· Updated Jun 17, 2026
CVE-2021-34593
CVE-2021-34593
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.
Affected products
3- Range: <V2.4.7.56
Patches
Vulnerability mechanics
References
4- packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.htmlnvdExploitThird Party AdvisoryVDB Entry
- packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.htmlnvdExploitThird Party AdvisoryVDB Entry
- seclists.org/fulldisclosure/2021/Oct/64nvdMailing ListThird Party Advisory
- customers.codesys.com/index.phpnvdVendor Advisory
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