CVE-2026-27663 Denial of service in CPCI85 Central Processing/Communication
Remote attackers can cause denial of service in Siemens CPCI85 and RTUM85 devices by exhausting resources with high-volume requests, requiring a reboot.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-27663?
CVE-2026-27663 is a high-severity denial of service vulnerability in Siemens CPCI85 Central Processing/Communication, published on 26 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.10), RTUM85 RTU Base (All versions < V26.10). The affected application contains denial-of-service (DoS) vulnerability. The remote operation mode is susceptible to a resource exhaustion condition when subjected to a high volume of requests. Sending multiple requests can exhaust resources, preventing parameterization and requiring a reset or reboot to restore functionality.
Weakness: CWE-770
Which versions are affected by CVE-2026-27663?
How do I fix CVE-2026-27663?
No fix has been published for CVE-2026-27663 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-27663 being exploited?
There is no known exploitation of CVE-2026-27663 in the wild and no public exploit code.
Sources
Also known as GHSA-j3fp-8j72-vf4g.