CVE-2026-27664: Siemens CPCI85 Central Processing/communication

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

A vulnerability has been identified in CPCI85 Central Processing/Communication (All versions < V26.10), SICORE Base system (All versions < V26.10.0). The affected application contains an out-of-bounds write vulnerability while parsing specially crafted XML inputs. This could allow an unauthenticated attacker to exploit this issue by sending a malicious XML request, which may cause the service to crash, resulting in a denial-of-service condition.

Affected products

• Siemens CPCI85 Central Processing/communication: before V26.10 (fixed in V26.10)
• Siemens Sicore Base System: before V26.10.0 (fixed in V26.10.0)

Published 2026-03-26. Last modified 2026-06-17.