CVE-2022-3181: 
Trihedral VTScada vulnerability analysis and mitigation

CVE-2022-3181 is an Improper Input Validation vulnerability affecting Trihedral VTScada versions 12.0.38 and prior when configured to accept incoming HTTP(S) connections. The vulnerability was discovered and reported by Trihedral to CISA, with a CVSS v3 base score of 7.5, indicating a high severity level (CISA Advisory).

The vulnerability stems from improper input validation (CWE-20) where a specifically malformed HTTP request can trigger a crash in the affected VTScada system. The vulnerability affects both local area network (LAN)-only and internet-facing systems. The CVSS vector string is AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, indicating that the vulnerability is network accessible with low attack complexity and requires no privileges or user interaction (CISA Advisory).

Successful exploitation of this vulnerability could cause a denial-of-service condition in the affected product, potentially disrupting operations in critical infrastructure sectors including Energy, Water and Wastewater systems (CISA Advisory).

Trihedral has released version 12.0.39 which fixes this vulnerability. For systems that must accept incoming HTTP connections, users should limit accepted connections exclusively to trusted LAN networks accessed by trusted personnel. Systems not configured to accept incoming HTTP connections are not affected. CISA recommends minimizing network exposure for all control system devices, locating control systems behind firewalls, isolating them from business networks, and using secure methods like VPNs for remote access (CISA Advisory).