CVE-2025-40771: Siemens SIMATIC CP 1542sp-1

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability has been identified in SIMATIC CP 1542SP-1 (6GK7542-6UX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1542SP-1 IRC (6GK7542-6VX00-0XE0) (All versions < V2.4.24), SIMATIC CP 1543SP-1 (6GK7543-6WX00-0XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0) (All versions < V2.4.24), SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0) (All versions < V2.4.24). Affected devices do not properly authenticate configuration connections. This could allow an unauthenticated remote attacker to access the configuration data.

Affected products

• Siemens SIMATIC CP 1542sp-1: before V2.4.24 (fixed in V2.4.24)
• Siemens SIMATIC CP 1542sp-1 Irc: before V2.4.24 (fixed in V2.4.24)
• Siemens SIMATIC CP 1543sp-1: before V2.4.24 (fixed in V2.4.24)
• Siemens Siplus Et 200sp CP 1542sp-1 Irc Tx Rail: before V2.4.24 (fixed in V2.4.24)
• Siemens Siplus Et 200sp CP 1543sp-1 Isec: before V2.4.24 (fixed in V2.4.24)
• Siemens Siplus Et 200sp CP 1543sp-1 Isec Tx Rail: before V2.4.24 (fixed in V2.4.24)

Published 2025-10-14. Last modified 2026-06-17.