Vulnerability identifier: #VU54325

Vulnerability risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-30190

CWE-ID: CWE-284

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
CODESYS V2 web server
Server applications / Web servers

Vendor:

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

---

External links
http://customers.codesys.com/index.php
http://customers.codesys.com/index.php?eID=dumpFile&t=f&f=14726&token=553da5d11234bbe1ceed59969d419a71bb8c8747&download=

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.