According to ICS-CERT, the vulnerability has been exploited in the wild since at least since January 2012. The vulnerability has been exploited in Sandworm campaign.
Vulnerable component: CIMPLICITY
CVSSv3 score: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-284 - Improper Access Control
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to improper access control and incorrect validation of the szScreen field when processing file uploads within the CimWebServer component. A remote unauthenticated attacker can upload and execute arbitrary file on the target system.
Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.
Note: this vulnerability has been exploited in targeted attacks.