Improper access control in CODESYS V2 web server - CVE-2021-30190

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Main Vulnerability Database Vulnerabilities #VU54325

Improper access control in CODESYS V2 web server - CVE-2021-30190

Published: June 23, 2021 / Updated: September 18, 2023


Vulnerability identifier: #VU54325
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Amber
CVE-ID: CVE-2021-30190
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: Public exploit is available
Vendor: CODESYS
Affected software:
CODESYS V2 web server

Detailed vulnerability description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the user management. A remote attacker can use a specially crafted web server request to bypass user management and read or write values on the PLC without authentication.


How to mitigate CVE-2021-30190

Install updates from vendor's website.

Sources