The vulnerability has been exploited in targeted attacks involving BlackEnergy Trojan.
Vulnerable component: Siemens SIMATIC WinCC
CVSSv3 score: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C
CWE-ID: CWE-20 - Improper Input Validation
The vulnerability allows a remote attacker to compromise vulnerable system.
The vulnerability exists due to improper input validation when processing packets sent to the WinCC server. A remote unauthenticated attacker can send a specially crafted packet and execute arbitrary code 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.