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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:Oct 26, 2021
    Last Modified:Aug 15, 2025
    EPS:Oct 26, 2021
    EPSS Score:0.01595
    CVSS Score:7.5

    Affected Products

    Vendor
    Codesys
    Product
    Plcwinnt
    Vendor
    Codesys
    Product
    Runtime Toolkit
    Vendor
    Wago
    Product
    750-8202
    Vendor
    Wago
    Product
    750-8202 Firmware
    Vendor
    Wago
    Product
    750-8203
    Vendor
    Wago
    Product
    750-8203 Firmware
    Vendor
    Wago
    Product
    750-8204
    Vendor
    Wago
    Product
    750-8204 Firmware
    Vendor
    Wago
    Product
    750-8206
    Vendor
    Wago
    Product
    750-8206 Firmware
    Vendor
    Wago
    Product
    750-8207
    Vendor
    Wago
    Product
    750-8207 Firmware
    Vendor
    Wago
    Product
    750-8208
    Vendor
    Wago
    Product
    750-8208 Firmware
    Vendor
    Wago
    Product
    750-8210
    Vendor
    Wago
    Product
    750-8210 Firmware
    Vendor
    Wago
    Product
    750-8211
    Vendor
    Wago
    Product
    750-8211 Firmware
    Vendor
    Wago
    Product
    750-8212
    Vendor
    Wago
    Product
    750-8212 Firmware
    Vendor
    Wago
    Product
    750-8213
    Vendor
    Wago
    Product
    750-8213 Firmware
    Vendor
    Wago
    Product
    750-8214
    Vendor
    Wago
    Product
    750-8214 Firmware
    Vendor
    Wago
    Product
    750-8216
    Vendor
    Wago
    Product
    750-8216 Firmware
    Vendor
    Wago
    Product
    750-8217
    Vendor
    Wago
    Product
    750-8217 Firmware

    Exploits

    http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.htmlhttp://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.htmlhttp://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.htmlhttp://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High