What is CVE-2026-27664?

CVE-2026-27664 is a high-severity vulnerability in Siemens Cpci85 Central Processing/communication, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-03-26.

How severe is CVE-2026-27664?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in Siemens Cpci85 Central Processing/communication

CVE-2026-27664

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 spec…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (18.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Siemens Cpci85 Central Processing/communication — versions 0
Siemens Sicore Base System — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

cert-portal.siemens.com/productcert/html/ssa-246443.html

Frequently asked questions

What is CVE-2026-27664?: CVE-2026-27664 is a high-severity vulnerability in Siemens Cpci85 Central Processing/communication, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2026-03-26.
How severe is CVE-2026-27664?: High severity. CVSS v3 base score is 7.5 out of 10.