CVE-2021-34593

HIGH

Wago 750-8202 Firmware < fw20 - Improper Exception Handling

Title source: rule

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.

References (4)

[Exploit, Third Party Advisory, VDB Entry] http://packetstormsecurity.com/files/164716/CODESYS-2.4.7.0-Denial-Of-Service.html

[Exploit, Third Party Advisory, VDB Entry] http://packetstormsecurity.com/files/165874/WAGO-750-8xxx-PLC-Denial-Of-Service-User-Enumeration.html

[Mailing List, Third Party Advisory] http://seclists.org/fulldisclosure/2021/Oct/64

[Vendor Advisory] https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16877&token=8faab0fc1e069f4edfca5d5aba8146139f67a175&download=

Scores

CVSS v3 7.5

EPSS 0.0159

EPSS Percentile 81.5%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-755

Status published

Affected Products (15)

wago/750-8202_firmware < fw20

wago/750-8203_firmware < fw20

wago/750-8204_firmware < fw20

wago/750-8206_firmware < fw20

wago/750-8207_firmware < fw20

wago/750-8208_firmware < fw20

wago/750-8210_firmware < fw20

wago/750-8211_firmware < fw20

wago/750-8212_firmware < fw20

wago/750-8213_firmware < fw20

wago/750-8214_firmware < fw20

wago/750-8216_firmware < fw20

wago/750-8217_firmware < fw20

codesys/plcwinnt < 2.4.7.56

codesys/runtime_toolkit < 2.4.7.56

Timeline

Published Oct 26, 2021

Tracked Since Feb 18, 2026