CVE-2025-40771 Missing authorization in SIMATIC CP 1542SP-1
Unauthenticated remote attackers can access configuration data on affected Siemens SIMATIC communication processors due to missing authentication.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-40771?
CVE-2025-40771 is a critical missing authorization vulnerability in Siemens SIMATIC CP 1542SP-1, published on 14 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-306
Which versions are affected by CVE-2025-40771?
How do I fix CVE-2025-40771?
No fix has been published for CVE-2025-40771 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-40771 being exploited?
There is no known exploitation of CVE-2025-40771 in the wild and no public exploit code.
Sources
Also known as GHSA-8x4j-8hhc-j8jf.