Auth bypass in Siemens Simatic Cp 1542sp-1
CVE-2025-40771
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.
Vulnerability class: Broken Authentication
EPSS: 0.005 (39.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Siemens Simatic Cp 1542sp-1 — versions 0
- Siemens Simatic Cp 1542sp-1 Irc — versions 0
- Siemens Simatic Cp 1543sp-1 — versions 0
- Siemens Siplus Et 200sp Cp 1542sp-1 Irc Tx Rail — versions 0
- Siemens Siplus Et 200sp Cp 1543sp-1 Isec — versions 0
- Siemens Siplus Et 200sp Cp 1543sp-1 Isec Tx Rail — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-40771?
- CVE-2025-40771 is a critical-severity vulnerability in Siemens Simatic Cp 1542sp-1, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2025-10-14.
- How severe is CVE-2025-40771?
- Critical severity. CVSS v3 base score is 9.8 out of 10.