Detections
Analytics
Wago CODESYS V2 Web-Server Heap-based Buffer Overflow (CVE-2021-34583)
high Tenable OT Security Plugin ID 503324
Synopsis
The remote OT asset is affected by a vulnerability.Description
Crafted web server requests may cause a heap-based buffer overflow and could therefore trigger a denial-of- service condition due to a crash in the CODESYS V2 web server prior to V1.1.9.22.This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
Refer to the vendor advisory.See Also
Plugin Details
Severity: High
ID: 503324
Version: 1.1
Type: remote
Family: Tenable.ot
Published: 9/9/2025
Updated: 9/9/2025
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2021-34583
CVSS v3
Risk Factor: High
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Information
CPE: cpe:/o:wago:750-823_firmware, cpe:/o:wago:750-831_firmware, cpe:/o:wago:750-881_firmware, cpe:/o:wago:750-829_firmware, cpe:/o:wago:750-8216_firmware, cpe:/o:wago:750-891_firmware, cpe:/o:wago:750-890_firmware, cpe:/o:wago:750-8210_firmware, cpe:/o:wago:750-8204_firmware, cpe:/o:wago:750-893_firmware, cpe:/o:wago:750-8217_firmware, cpe:/o:wago:750-8211_firmware, cpe:/o:wago:750-8212_firmware, cpe:/o:wago:750-8202_firmware, cpe:/o:wago:750-862_firmware, cpe:/o:wago:750-8203_firmware, cpe:/o:wago:750-8208_firmware, cpe:/o:wago:750-882_firmware, cpe:/o:wago:750-885_firmware, cpe:/o:wago:750-852_firmware, cpe:/o:wago:750-832_firmware, cpe:/o:wago:750-8206_firmware, cpe:/o:wago:750-8207_firmware, cpe:/o:wago:750-880_firmware, cpe:/o:wago:750-889_firmware, cpe:/o:wago:750-8213_firmware, cpe:/o:wago:750-8214_firmware
Required KB Items: Tenable.ot/Wago
Exploit Ease: No known exploits are available
Patch Publication Date: 10/26/2021
Vulnerability Publication Date: 10/26/2021
Reference Information
CVE: CVE-2021-34583