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High VDE-2021-049 1 CVE

WAGO: Denial of Service Vulnerability in CODESYS Runtime 2.3

Published Nov 16, 2021 · Updated May 22, 2025 · Revision 2

Vendor: WAGO Product: 750-8202/xxx-xxx Product: 750-8203/xxx-xxx Product: 750-8204/xxx-xxx Product: 750-8206/xxx-xxx Product: 750-8207/xxx-xxx Product: 750-8208/xxx-xxx Product: 750-8210/xxx-xxx Product: 750-8211/xxx-xxx Product: 750-8212/xxx-xxx Product: 750-8213/xxx-xxx Product: 750-8214/xxx-xxx Product: 750-8216/xxx-xxx Product: 750-8217/xxx-xxx

Summary

A Denial-of-Service Vulnerability was reported in CODESYS 2.3 Runtime. The CODESYS 2.3 Runtime is an essential component in several WAGO PLC's. All vulnerable PLCs are listed in chapter 'Affected Products'.

Details

Impact
The reported vulnerabilities allow an attacker who has access to the device and is able to exploit the vulnerability, to manipulate and disrupt the CODESYS 2.3 Runtime of the device.

Mitigation
1. Use general security best practices to protect systems from local and network attacks.
2. Do not allow direct access to the device from untrusted networks.
3. Update to the latest firmware according to the table in chapter solutions.
4. Disable the CODESYS 2.3 port 2455.

Vulnerabilities 1

  • High 7.5
    CVE-2021-34593

    CODESYS V2 runtime: unauthenticated invalid requests may result in denial-of-service

    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…

    CODESYS CODESYS V2 ICS / OT

Revision history

  1. #2

    Fix: version space, added distribution, quotation mark

  2. #1

    initial revision

References